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gap set on plugs.

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Old Dec 1, 2004 | 04:49 PM
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Default gap set on plugs.
Hey, I am ventouring in to the engine compartment. Can anyone tell me what the gap on the spark plugs should be on a 79 corvette I believe it is a L-48.
thanks
steve
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Old Dec 1, 2004 | 05:00 PM
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.030 but its not very important.
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Old Dec 1, 2004 | 05:48 PM
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If you're runing HEI ignition with the stock compression ratio, use .045". If you have high compression (above 10:1), run .035".
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Old Dec 1, 2004 | 05:51 PM
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What if you are running 10 3/4 CR and have a full MSD ignition?
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Old Dec 1, 2004 | 06:05 PM
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Originally Posted by 7t2vette
What if you are running 10 3/4 CR and have a full MSD ignition?
I have dynoed motors with compression anywhere between 9.0-1 and 16.0-1 with MSD ignition and never found it to be a benifit to run gaps larger than .035. It will still work with the larger gaps but there is no gain and you put more stress on all the ignition components.
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Old Dec 1, 2004 | 11:23 PM
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As long as your motor is pretty much stock the gap should be .045" with the stock HEI distributor.
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