yeah the alternator is the tensioner basically cause it has seperate belts for each accessory. and its a bitch to tension the belt but of course every time we were wrenching on it it was like 45 degrees and dark outside
and yeah dont over-rev it. interference motor FTL
edit: and oh yeah, shanes car hung with a stock LS1 trans am (automatic) up to about 80mph. all shane had was a turboback exhaust and free mods