Re: Spark plug gap
The colder the plug, the faster the plug dissipates heat, especially with alum heads, the more rpm needed to keep the electrodes hot to burn off the deposits.
Lower the operating rpm, now the colder plugs become fouled quicker. Its like an "either/or" situation, high rpm, colder plug, lower rpm, hotter plug.
A wider gap has a shorter spark in duration with a high potential, meaning more kilovolts compared to a smaller gapped plug, longer time with lower kilovolts. It all depends on how much the coil is designed to be saturated with current running through it. Higher rpm, shorter amount of time to saturate the coil, less spark potential. HEI's generally allow 0.045" gap; some were up to the 0.060" gap.
All said, I'd stick with the plug type installed in the engine when delivered.
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