hey, I was wondering if the underdrive pulleys from auto specialties are a good upgrade for the 5.3 motors. I just wanna get some input before shelling out $225.00 buxs.

http://store.summitracing.com/partde...5&autoview=sku

 

there are already several threads on this. just do a search and you will come up with a lot of info. ap2002 picked up almost 2 tenths with his old 5.3 with all bolt ons and cam. different trucks react differently to mods.