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Thread: Which Spark Plug

  1. #1
    Senior Member DYNO OPERATOR
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    Which Spark Plug

    Hey guys, I am needing some advice on selecting a spark plug. I have a 421 SBC on alcohol. The compression is 14:1 I have a MSD 7AL-2 with a baster coil to provide the spark. Not too familiar with alcohol. What plugs would yall recommend. Any help or advice would be greatly appreciated.

    Chris

  2. #2
    Senior Member RACING JUNKIE
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    Which heads? If you have Brodix heads you can go to their website and they have recomendations. I run the NGK plugs which they call for with Track 1's



    Zip.

  3. #3
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    Quote Originally Posted by zipper06
    Which heads? If you have Brodix heads you can go to their website and they have recomendations. I run the NGK plugs which they call for with Track 1's

    Zip.
    They are Pro Comp aluminum heads. Don't know that much about them. 190cc intake runners
    2.02 intake 1.60 exhaust SS valves
    Also what gap should I start at?

    Chris

  4. #4
    Senior Member RACING JUNKIE
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    I run .030 gap with alcohol.

    Zip.

  5. #5
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    Quote Originally Posted by zipper06
    I run .030 gap with alcohol.

    Zip.
    Appreicate the help, which NGK plug?

    Chris

  6. #6
    Senior Member RACING JUNKIE
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    NGK-R5671A-9 for alcohol

    NGK-R5671A-8 for gas

    Depending on the compression you have you should probably index the plugs just to be on the safe side.

    Zip.

  7. #7
    Senior Member DYNO OPERATOR
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    Thanks Zip

  8. #8
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    when you index them.witch way sould they be facing ?????

  9. #9
    Senior Member EXPERT BUILDER
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    My Enderle Alcohol injected Altered has a 13.5:1 sbc 434 with Brodix 11X heads and I run NGK B9ES plugs gaped at .035 and I run an MSD7AL3 with a Pro Power coil. Very reliable with no issues.

  10. #10
    Senior Member RACING JUNKIE
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    Quote Originally Posted by bigray
    when you index them.witch way sould they be facing ?????
    between 10 and 2
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com


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