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Rpm
The reason for the bigger stroke than bore is that the engine master challenge only measure horsepower and torque up to 6500 rpm I believe. Its designed to limit the rpms by the rules set forth. If they measured horsepower up to 8000 rpm I believe you would see more shorter strokes but maybe not. The engine builders want to make as much HP/Tq through the rpm range and it would seem that bigger stroke small bore does the trick up to the specified RPM. Just my opinion.
later
dennis
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