Thread: Pulley Size?

Hello, We have stock sc engine with fender well intake and 110,000 miles. The car has been well taken care of and runs perfect. We are installing SLP headers, 180 thermostat, 1.9 rockers and getting a good tune. From what I've read I'm thinking a 3.4 pulley should be safe. Does that sound correct to you people with experience?

Thanks in advance

3.8 pulley sounds safe. Anything else and you're asking for trouble.

Sure.

Only one way to find out is scan.

Go get an aeroforce gauge before doing anything and see how the car is running.

Thanks for the input. This car is stored in the winter if the helps. Maybe I'll order both the 3.4 and 3.5 and have them both ready for the tune and go with the best fit.

You'll be fine with a tune IMO, I just picked up a 3.4 & our setups will be close. I am getting mine tuned come October-ish so hopefully I will be decently tuned for summer & winter performance. You might wanna think about springs with the 1.9's though. I probably should have upgraded with my 1.84's. Scanning is king!

I'd upgrade springs ANYTIME I'd touch a tired 3800 valvetrain.

Stock springs are weak and are gonna for sure float on high ratio rockers with higher than stock shift points.

L76's or LS6 springs can be had super cheap...get those installed while you're in there.