Are those underdrive pulleys worth anything? I was thinking about getting one, aeromotive I think. Its an aluminum piece, looks nice and smaller/lighter then the stock unit. Should I waste $50 or not? Thanks guys. A tenth improvment I would consider huge!

 

Dont waste your money on them. The real drain on the lt1 is the water pump and its not driven by the belt. You also have to buy a new 20 dollar belt.

 

Cool. When I got my water pump (electric), I did that, RR and headers at the same time and the difference was very noticable!

 

If you got any, I'd get the ASP integrated dampner/pulley, which will save some weight on the crank and save you from having to put the stock dampner back on. I think it's a 26 or 34% underdrive.