I ran one of them on a round track race car, with a home-brewed 4" diameter aluminum pulley to keep from overspeeding it at the end of the straightaway when we were turning 7K+ RPM. It worked great, and kept the battery voltage up enough to get better performance from the HEI ignition system. Most of our competition didn't run a charging system and their electrical system voltage was down around 11.5 volts or so.
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!