I recall 1100 fpm as a magic number, but it was related more to a structural limit, either you couldn't aspirate faster, or perhaps fatigue on the rod ends. Been 40 years too long since I was a hot rodder. You may be correct on the ignition limit as I recall there was no point going beyond a certain amount of advance.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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