Spark Plug Type MerCruiser MCM 4.3 L V6


What are the correct brand of spark plug for a MerCruiser 4.3 L V6 LX Alpha 1 engine? I could also use the spark plug gap spec. Thank you.

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Jeffrey Petree 3 years 2021-02-08T19:18:57+00:00 1 Answer 2914 views Beginner 5

Answer ( 1 )


    The factory service manual recommends two brands of spark plugs. Which one you choose is up to you. You can use AC Delco or Champion.

    Here are links to the correct type of spark plugs:

    AC Delco spark plugs:

    Champion spark plugs:

    Here is a screenshot of spark plug specifications from the factory service manual.

    [table id=20 /]
    Notations: Sea Rap to MerCruiser cross references include;
    4.3L-2 same as MCM 4.3L
    4.3L-4 same as MCM 4.3LX

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