Ok, as RRS reasons, it seems to me it would be a fixed amount rather than a percentage. Dennis Quella at PPC in Castle Rock, CO. told me about 90 - 100 horsepower. I know that he has built several motors and run them on a dyno and probably a chassis dyno. What prompted the question was the comment above about 308bhp and 262 at the wheels. That is only 46 hp loss through the drive train. Thanks to all who commented.
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