Not Ranked
When you are really trying to wringe every last HP out of an engine, spark plug indexing and gap tuning become important. However, you have to identify your ideal operating RPM and tune for that range. Frankly, for the variety of driving you are apt to do with your car, I would go with .045.
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RCR GT40 SOLD to Fast 5
Kirkham #690 289 FIA
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