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    Simplest Spark Plug Question Beating my brain

    "I was just given a 1974 Runab "I was just given a 1974 Runabout with a 140 OMC I/O motor Model No. 990225A. This is my first boat. I want to change the spark plugs and there were 4 different types in the existing motor. Ac delco (MR43T), champion (RV8C), autolite (Smudged) and a NGK (DR5HS)...
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