Take a drive with the fan removed- - - -I think you'll be able to figure out where most of the noise is coming from. It doesn't make good nonsense to be worried about running an engine up to the RPM range where the factory rated its horsepower as long as the bottom end bearings are in good shape..
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!