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It has already been said, but the magic that goes on between the cam lobes, the intake and exhaust flow, the compression, has to be a cohesive package. High compression, big cams for instance don't guarantee power. You have to find what works together, and that can take enormous time and effort. It isn't necessarily intuitive. To quote a north Ga drag motor builder who's engines were legendary, ''no we are not geniuses, we have for years just been willing to come to work and try different things, everyday.'' Trial and terror
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