SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: SpectraRyan on August 11, 2017, 03:15:43 PM
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Hey guys, putting new plugs in our boat. Just had the heads cleaned and re surfaced and fixing a couple other things. Anyways my question is what plug gap should I run. I was told to use acdelco MR 43 plugs. It's a 502 HO BBC with a msd marine 6 blue box, Hardin billet distributor and msd coil.
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I have the 6al box and I run mine at 42. I also run the mr43. Not sure if it's the best gap but, It runs good so I leave it lol.
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Except now I have a slight misfire but, it's not because if the plugs.
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It really depends on the compression ratio..... You will probably find .040" works great...
GT
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It really depends on the compression ratio..... You will probably find .040" works great...
GT
It's stock wick I believe is 8.75 to 1
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It's stock wick I believe is 8.75 to 1
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Gap at .040" to .042" and let it buck... The difference between a gap of .035" and .050" will be completely immeasurable...
JMHO
GT