Aluminum pulleys

The more rotational weight you take off the pulleys, the more power can go into the trans instead.

I think the largest single gain would be from jackshaft or crank pulley. I run AI jackshaft, water pump and supercharger pulleys. Not sure a butt dyno could tell it, tho, but w/other mods I'm enjoying 14 lbs. boost on my '90 SC that builds faster than when stock.
 
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I was thinking it might help in acceleration since it would be less weight. I didn't want to do a different size od pulley only because my 90 is running hot right now and can't figure out why. I'll be adding an aftermarket radiator, fuel pump, injectors and water pump before doing anything with boost. I'm afraid I'll run too lean.
 
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