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Thread: Spark plugs

  1. #1

    Default Spark plugs

    What is the difference between marine spark plug and a auto spark plug?

  2. #2
    Join Date
    Dec 2006
    Chaumont Bay, N.y., USA

    Default Re: Spark plugs

    Ayuh,..... Depends,.....

    With AC Delco, for the Chevy motors, the auto plug is R43T, a steel bodied plug,....

    The Marine version is MR43T, an alloy bodied plug, much less prone to Rust,....
    Any Grease is Better,... Than No grease at All....

  3. #3
    Join Date
    Sep 2008
    Hague, Virginia, USA

    Default Re: Spark plugs

    And less prone to meld with a cast aluminum head. However, it's still a good practice to pull the plugs and inspect every season. Then when you re-install put a light coat of high-temp grease on the threads.
    CHawk 25 DLX

  4. #4
    Join Date
    Sep 2008
    Maryland - USA

    Default Re: Spark plugs

    The plating on the metal shell....in the better quality plugs.....

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