821M
Champion
Spark Plug
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.
| Manufacture | Number |
| ACDelco | M40FFX |
| ACDelco | M41FF |
| Autolite | 2634 |
| Bosch Automotive | W4A |
| Bosch Automotive | W4A1 |
| Bosch Automotive | W4A2 |
| Bosch Automotive | W4A5 |
| Bosch Automotive | W4AC |
| Bosch Automotive | W4AS |
| Motorcraft | AE091X |
| Motorcraft | AV091X4 |
| NGK | B10HS |
| NGK | B9HS |
| NGK | B9HS10 |
| NGK | B9HV |
| Denso | W31FS |
|
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