Hey guys,

I have a Vortech S-trim supercharger on an LT1 with aftermarket heads/cam. I am currently running a 2.95" blower pulley and stock 6" crank pulley - and seeing around 7.5 psi. boost.

My question is: How much boost will I gain from switching to a 6.66" crank pulley from the 6" crank pulley that I currently have on?? I just bought this pulley but haven't installed it yet - so I'm wondering how much more boost I can expect to see with it.

Also - how tight should the blower belt be? Should I expect to buy a new belt with this new set-up?

thanx in advance...