After market pulleys..

I run a March under drive, two groove crank pulley. At the time I was running power steering. I was throwing belts at 6500 rpm. Bought the pulley no more belt throwing. Never really slipped the belt, but rolled and threw a bunch. Not to mention I was running the stock A/C crank pulley which weighed 14 lbs! compared to 3 lbs for the march pulley.