Spark Plug Gap??
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Spark Plug Gap??

  1. #1
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    Default Spark Plug Gap??

    Hi Guys,

    New to the forum, basically been doing a lot of reading, this is my first post. I actually made it through all 150+ pages of the "Jet Boat Pics" thread...

    Anyway, I picked up a 1990 Carerra 20.5 Elite with a 454 BBC (4-Bolt). It has been a corrosion nightmare. It has a Holly Marine 750DP that had a bunch of work done on it by JP Marine and a hi-rise manifold, it also has a Mallory Distributor the 609 Magnetic Breakerless Ignition Module. Nothing special, I was told it has a mild cam, but I couldnt tell you either way. The carb has been completely rebuilt, the alternator came apart and the internals were basically turned into power, got that rebuilt. The Glenwood headers and Risers were slightly leaking as well as being seized together, and it had a very minor exhaust leak.

    Ive checked the distributor and there is no signs of corrosion, thank god, so the last thing is the spark plugs.

    I have found several posts, but none of them truly specifying a definitive spark plug gap. I have seen .35, .40, .45. I picked up the AC Delco MR43T's and wanted to make sure I get the gap right.

    Based on what I have, what should my gapping be. It misses slightly on the bottom, and slightly at WOT. Not terrible, but noticable to the right ear.

    Also, what works best on aluminum corrosion? I was told Alumabrite by Aurora works pretty good, but my local dealer wont have any in till next month. Didnt know if anyone has any other suggestions for getting corrosion off aluminum. I can post pics if needed so you can see how bad it is.

    Thanks in Advance

    Chills

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  3. #2
    LIQUID QUARTER MILE Pro Mod's Avatar
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    welcome .037-.040 with msd go .045
    HOT ROD BOATS
    ANGIER, NC

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  4. #3
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    Default

    Quote Originally Posted by Pro Mod View Post
    welcome .037-.040 with msd go .045
    Thanks Pro Mod

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