The Weiand unit mentioned in the first post is a slightly upgraded version of the Detroit Diesel blower. It produces massive gains in horsepower and torque, but it takes lots of power just to turn it. The most common failure when it's coupled up to a stock-type crankshaft is that the crank snout gets twisted off trying to turn the blower. The slightest hint of detonation on a blower engine will launch the blower through the hood from an intake manifold explosion, so the compression ratio and ignition timing must be perfect. Fun at the drag strip, but totally impractical on the street.
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!