I was wondering what size Pulley I'm running? Not sure how to tell, but it looks as if the guy who owned the car before me put a stage 2 kit on it. The car runs around 15psi at higher rpms. Thanks for any helpful info!

 

I think most pulleys have a number branded on them try looking at the pulley.

 

Blue bolts?

 

see what color your upper part of the injectors are, if their black, more than likley GM stage 2, also like tyler said, if the bolts holding the pulley on are blue, it is a gm kit.

 

or you could just measure it

 

Blue and 77.9? So that translates to a 3.0?

 

Blue bolts means you have GM Stage 2!

 

77.9 is something like 3.06.

 

its the stage two pulley. The pulley black and look oem besides the bolts?

 

Yeah its black, how small of a pulley can I run on this setup

 

2.9 would be safe to run with that setup

 

What do I need to change on it to say run a 2.6 or 2.8? I have no intentions on doing anything myself.I'm simply gathering information for future plans. Again thanks footer all the information this far!

 

U can run a stage 3 pulley 76 mm aka 2.99 but i wouldnt run a true 2.9 pulley without getting bigger injectors, when i got tuned for my gm stage 2(same kit ur running but im custom tuned) my injectors was around 102% iv heard u can go up to 120% without much problema but i wouldnt trust it, but also it has alot to do with where u live, they are some guys that are able to run a 2.8 with the gm 42 stage 2 injectors. Like i saide tho atmost id run gm stage 3 pulley or maybe a custom 2.95 but u got to make sure the pilley fits the gm hub otherwise u need a new hub with the pulley

 

Well I'm located in PA. Yeah I have to check what fuel injectors i'm running. I just wanted to know if I needed to do anything internaly before some form of a stage 3 with tune.