4013 | Herko Automotive

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Part Number

4013

Brand

Champion

Part Type

Spark Plug

California Proposition 65

WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or reproductive harm. For more information go to www.P65Warnings.ca.gov.

We are working on our database, we will soon have any updated information, for more information contact us, sorry for the inconvenience

Year	Make	Model	Engine	Notes
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Suburban 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Suburban 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2002	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Suburban 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2002	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Suburban 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Tahoe	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Suburban 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Suburban 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Suburban 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Tahoe	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Tahoe	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Tahoe	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2001	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.060 in; Original Equipment Is Iridium;
2004	Chevrolet	Tahoe	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Tahoe	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; RWD
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Express 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; RWD
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; RWD
2005	Chevrolet	Express 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; RWD
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; RWD
2005	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Express 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; RWD
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; RWD
2005	Chevrolet	Express 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; RWD
2005	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	GMC	Sierra 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; RWD
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2008	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: J
2007	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; RWD
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: J
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2008	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: J
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: J
2008	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: J
2007	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2008	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: J
2006	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; RWD
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; RWD
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2006	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Gap 0.040 in; Original Equipment Is Iridium;

Year	Make	Model	Engine	Trim	Notes
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	LS Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	LS Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SLT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	SLT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SLE Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SLE Cab & Chassis 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	LS Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	WT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	LS Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	LT Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SL Cab & Chassis 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.060 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	WT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 FLEX OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SLE Cab & Chassis 2-Door	Gap 0.060 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Base Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Base Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	LT Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	WT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	LS Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 FLEX OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	LS Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SL Cab & Chassis 2-Door	Gap 0.060 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	WT Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	SLT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	SLE Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	SLT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	SLE Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	SLE Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	SLE Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	WT Cab & Chassis 2-Door	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	WT Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SLE Cab & Chassis 2-Door	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SLE Cab & Chassis 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	SLE Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Suburban 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Sport Utility 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Suburban 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LS Sport Utility 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2002	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Suburban 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LT Sport Utility 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2002	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Suburban 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LT Sport Utility 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Tahoe	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LS Sport Utility 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Suburban 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Sport Utility 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Suburban 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Sport Utility 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Suburban 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LT Sport Utility 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Tahoe	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Sport Utility 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Tahoe	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Sport Utility 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
1999	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SL Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SL Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SL Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	SL Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SL Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SL Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	HT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	HT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SL Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SL Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	SL Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SL Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SL Extended Cab Pickup 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SLE Crew Cab Pickup 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2001	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SLT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SLE Crew Cab Pickup 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SLT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	SLE Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SLT Crew Cab Pickup 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.060 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SLT Crew Cab Pickup 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Crew Cab Pickup 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	SLT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	WT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Z71 Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	SLT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.060 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SL Crew Cab Pickup 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Tahoe	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LT Sport Utility 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SLT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2001	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SLT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	SLT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	WT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.060 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2003	GMC	Sierra 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SL Standard Cab Pickup 2-Door	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2001	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SLT Extended Cab Pickup 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2003	GMC	Sierra 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	SLT Extended Cab Pickup 4-Door	Gap 0.060 in; Original Equipment Is Iridium;
2004	Chevrolet	Tahoe	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Sport Utility 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Tahoe	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LT Sport Utility 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2002	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SLE Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	SLE Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	SLT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	WT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	WT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cargo Van 3-Door	Gap 0.040 in; Original Equipment Is Iridium; RWD
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	WT Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Express 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cargo Van 3-Door	Gap 0.040 in; Original Equipment Is Iridium; RWD
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	WT Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Passenger Van 3-Door	Gap 0.040 in; Original Equipment Is Iridium; RWD
2005	Chevrolet	Express 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cargo Van 3-Door	Gap 0.040 in; Original Equipment Is Iridium; RWD
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Passenger Van 3-Door	Gap 0.040 in; Original Equipment Is Iridium; RWD
2005	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	WT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Z71 Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SLT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Express 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Passenger Van 3-Door	Gap 0.040 in; Original Equipment Is Iridium; RWD
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cargo Van 3-Door	Gap 0.040 in; Original Equipment Is Iridium; RWD
2005	Chevrolet	Express 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Passenger Van 3-Door	Gap 0.040 in; Original Equipment Is Iridium; RWD
2005	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	GMC	Sierra 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	WT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	GMC	Sierra 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	GMC	Sierra 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Classic LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Standard Passenger Van 3-Door	Gap 0.040 in; Original Equipment Is Iridium; RWD
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Classic LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Classic LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Classic WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	WT Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Classic WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	WT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	WT Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2008	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Classic WT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	WT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	WT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 FLEX OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: J
2007	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Standard Cargo Van 3-Door	Gap 0.040 in; Original Equipment Is Iridium; RWD
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	LTZ Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LTZ Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SLE Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 GAS OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: J
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	WT Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2008	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	WT Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Classic LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	GMC	Sierra 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	SLE Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Classic WT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 GAS OHV Naturally Aspirated	SLE Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: J
2006	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 FLEX OHV Naturally Aspirated	SLE Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: J
2008	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 FLEX OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: J
2007	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LTZ Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	SLE Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	WT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2008	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 GAS OHV Naturally Aspirated	SLE Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: J
2006	GMC	Sierra 1500	5.3L 5328CC 325Cu. In. V8 FLEX OHV Naturally Aspirated	SLE Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2008	GMC	Sierra 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	SLE Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	Classic LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	WT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Extended Cargo Van 3-Door	Gap 0.040 in; Original Equipment Is Iridium; RWD
2005	Chevrolet	Express 2500	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Extended Passenger Van 3-Door	Gap 0.040 in; Original Equipment Is Iridium; RWD
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	LTZ Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	WT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	Classic LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LTZ Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	LT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 FLEX OHV Naturally Aspirated	Z71 Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2006	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LS Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	WT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Cab & Chassis 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2003	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated	LT Cab & Chassis 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2001	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2004	Chevrolet	Silverado 1500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	Z71 Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium; VIN: Z
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	LT Extended Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2002	Chevrolet	Silverado 2500 HD	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2006	Chevrolet	Silverado 1500	4.8L 294Cu. In. V8 GAS OHV Naturally Aspirated	LT Crew Cab Pickup 4-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	Base Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LT Cab & Chassis 3-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	5.3L 323Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2007	Chevrolet	Silverado 1500	5.3L 325Cu. In. V8 GAS OHV Naturally Aspirated	LTZ Standard Cab Pickup 2-Door	Gap 0.040 in; Original Equipment Is Iridium;
2000	Chevrolet	Silverado 2500	6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated	LS Cab & Chassis 3-Door	Gap 0.040 in; Original Equipment Is Iridium;

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