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Spark Plugs for US Marine Power Inboard (351) in a 1990 3888

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    Spark Plugs for US Marine Power Inboard (351) in a 1990 3888

    I have a 1990 3888 and can't figure out which spark plugs to put in the 351 US Marine engines. Nobody can seem to match the Champion plugs that are currently in it, and I'm not sure if they are even correct for those motors. Does anyone have a manual with the correct plug numbers or a current cross reference for them?

    #2
    I assume the base engine is a ford 351 cleveland (it takes the smaller 14mm spark plugs, and I cant imagine anyone using a winsor motor in a boat, which takes STANDARD SIZE plugs)... and if it is the cleveland with the smaller plugs, i would use spark plugs for it, only one range hotter.. personally, i prefer the ac delco plugs to the champions... or.Bosch...or NGK... champion is prettylow on my list.


    NU LIBERTE'
    Salem, OR

    1989 Bayliner 2556 Convertible
    5.7 OMC Cobra - 15.5x11 prop
    N2K equipped throughout..
    2014 Ram 3500 crew cab, 6.7 Cummins
    2007 M-3705 SLC weekend warrior, 5th wheel
    '04 Polaris Sportsman 700 -- '05 Polaris Sportsman 500 HO
    Heavy Equipment Repair and Specialty Welding

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    • Nauti_Mike
      Nauti_Mike commented
      Editing a comment
      Actually the Windsor was used widely in marine applications and not the Cleveland.

    #3
    Motorcraft ASF-32C, gap .035.
    Joon, Kathy, Jaden & Tristan
    Uniflite 42 AC, DD 671N
    93 3058 sold
    92 2855 (day boat)
    91 Fourwinns 205 (lake boat)
    Longbranch WA
    Life is Good

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      #4
      I’m not much of believer in some aftermarket claims, especially in odd designs. That said, on my previous boat, a 1980 Encounter Sunbridge with a pair of 4.3’s and counter rotation Alpas, I tried the E3 brand plugs and reduced my fuel burn by around 10%. At one point I changed back to a set of regular style plugs and immediately noticed a change in my cruise throttle settings. Just my experience for what it’s worth.
      P/C Pete
      Edmonds Yacht Club (Commodore 1993)
      1988 3818 "GLAUBEN”
      Hino EH700 175 Onan MDKD Genset
      1980 Encounter Sunbridge "Misty Blue" (Sold)
      MMSI 367770440
      1972 Chevrolet Nova Frame off Resto-mod in the garage
      Boating on the Salish Sea since 1948

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        #5
        Thanks for the responses! I found that the champion plug is an RVI5YC4

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