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Actually I wondered about this in my big block TransAm days. I always wondered why if I advanced timing th rpm went up, I would turn the idle down and then more timing advance, idle down. But I was going for horsepower out of a 425 cubic inch Oldsmobile big block not concerned with mpg
I would love to test this with a scan gauge hooked up. Maybe get rid of vacuum advance and just have the weights. Some Sport bikes have fixed timing. Always wondered how that worked.
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