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Old 11-11-2012, 03:37 PM
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Quote:
Originally Posted by ap72 View Post
a stock cast crank is usable past 7,000 rpm, BUT you need to properly machine and build your engine and use the lightest rod/piston assembly you can.

Losing weight on your rotating assembly goes a LONG way when you start going into higher RPM. The same holds true for your valve train.
I have seen plenty of broken cast cranks in 375 horse circle track engines over the years that turn up to 6000 RPM.
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