P-51 Spark Plug Gap? - 460 Ford Forum
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post #1 of 5 (permalink) Old 06-16-2015, 08:41 AM Thread Starter
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P-51 Spark Plug Gap?

I have a set of P-51's on a 521cid and am running the NGK R5671A-8 spark plugs. No power adders and 110 octane race gas.

What should my spark plug gap be?
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post #2 of 5 (permalink) Old 06-16-2015, 09:07 PM
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.028" -.030" should work.

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post #3 of 5 (permalink) Old 06-17-2015, 07:36 AM Thread Starter
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Thanks Lem. I know I've asked before. I'll write it down this time.
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post #4 of 5 (permalink) Old 06-17-2015, 10:39 AM
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Quote:
Originally Posted by Lem Evans View Post
.028" -.030" should work.

Lem, I'm running the kaase SCJ 521 CI 13:1 CR n/a 800 hp dynoed on VP c12 (108 octane)

I've been running my gap with the same spark plug @ .035

My question is, have/am I leaving anything on the table running the gap .005 bigger?
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post #5 of 5 (permalink) Old 06-17-2015, 03:07 PM
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I doubt it's that much....it's easier on the cap, wires, etc. if the gap is not bigger than it has to be.

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