[EddieG911]

whats the smallest pulley i can put on a stock 04 SS????

 

[05ss45]

if i were u i would not change it without the right supporting mods.

wich would be on this link

http://www.zzperformance.com/grand_prix/articles1.php?id=35

 

[04DetroitLS]

Stock size is 3.8, you could prob get away w/ running a 3.6 w/ a CAI/FWI, 180 t-stat, colder plugs and a tune, anything smaller than that would need supporting mods. Even w/ that you'll want to buy something to keep an eye on KR (like a LS1M Scanner or aeroforce scan gauge))

Better question to help you out is how fast do you want to go?
Right now you're prob @ about 15.0-14-8 in the 1/4.
If youre looking to drop pullies, i would buy an MPS (modular pulley system), trust me, once you start modding (and its hard to stop ) its easier to remove 5 screws to swap pullies than to remove and press on a new one