MB42K AC Delco GM Marine Engine Spark Plug

Equivalent to Autolite 303; Champion J4C, J6C; NGK B6S, B6S BL1; Denso W20S-U; General Motors 5613152.

Please check the part numbers for your fitment needs. If you are unsure whether this part fits your model, please contact us with your serial number and we can help determine if it is right for your engine.

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