spark plug gap

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thanson_mopar

thanson_mopar

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the spec for small block spark plug gap was .35 correct? Maybe this is a dumb question but my engine is not stock, i run mopar chrome box with aftermarket coil, since I have more available volatage to jump the gap than stock should I run a longer than stock gap on the plugs?
 
I run a .040 plug gap. I ran this with the MoPar chrome box and now with the MSD ignition. Seems to work well.

Fred B
 
You should be able to go as far as .55 believe it or not, however, I doubt you'll find a gain with it there that wide. Best test is at the track until performance falls off. .40 is a safe bet for now.
 
In the MSD instruction manual there's a chart that tells you what plug gaps to use based on your comp. ratio. I have stock pistons with MSD box, coil, and dist. and my 360 seems to like .45 just my two cents
 
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