Fortunately, "high" RPM on a stovebolt is somewhere just below 4K, unless some pretty exotic work is done to the cylinder head, camshaft, carburetion, and exhaust system! It sort of seems like the guys who designed the engine knew what they were doing!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!