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Thread: BBC spark plug gap help

  1. #1
    Junior Member APPRENTICE
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    BBC spark plug gap help

    I am currently running .044 on NGK R44 or R45 have pro comp aluminum heads 10.5:1 comp. Accel high performance HEI distributor with accel 8.5mm plug wires. I was gapped at .050 and ran .6 slower than with current gap. Question is will I see better et with a smaller gap? Also looking to get a larger carb. Any opinions?

  2. #2
    Senior Member RACING JUNKIE Swiley383's Avatar
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    I ran my big block at0.35 it was 9.5 to1 with iron heads and a 850 carb

  3. #3
    Senior Member RACING JUNKIE
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    I'd say .040 but it has a lot to do with Compression ratios, Combustion Chamber configuration, and timing, as well as what fuel you're using . .

    Just another one of those things that make each of our engines "a little different" . .

  4. #4
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    I'll gap my spare plugs at .040 and swap them out at the track to see what happens. I'm running 110 fuel only.

  5. #5
    Administrator RACING JUNKIE bjuice's Avatar
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    Re: BBC spark plug gap help

    Quote Originally Posted by duby05
    I am currently running .044 on NGK R44 or R45 have pro comp aluminum heads 10.5:1 comp. Accel high performance HEI distributor with accel 8.5mm plug wires. I was gapped at .050 and ran .6 slower than with current gap. Question is will I see better et with a smaller gap? Also looking to get a larger carb. Any opinions?
    Whaaat ? you have.6 slower...thats 6/10ths.. Ain't No way !!! .daym mine didn't slow down that much after breaking push rod wiping out cam lobe dropping a cylinder.....do you mean .006 ????? :shock:
    Bjuice..

    "I'M YOUR HUCKLEBERRY ! "

  6. #6
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    Nope I meant .6...first pass ran a xx.61 something didn't feel right and only thing that had been changed was plug gap, pulled plugs re gapped and ran xx.01

  7. #7
    Senior Member RACING JUNKIE Swiley383's Avatar
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    I think you may have had a diffrent problem that was fix when you pulled the plugs like a bad connection/ connections on your plug wires. how much did your MPH drop off?

  8. #8
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    Only a few mph

  9. #9
    Administrator RACING JUNKIE bjuice's Avatar
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    Quote Originally Posted by duby05
    Only a few mph
    a few MPH is a lot of ET....1/2 second or 2 mph in my Outlaw car is 3 car links easy... thats a Big Loss !
    Bjuice..

    "I'M YOUR HUCKLEBERRY ! "

  10. #10
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    All is well right now. Going to see what a .040 gap does for me


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