Hello, I just found this message... had no idea you sent it. Sorry about that. I had a 2.5" pulley on mine for a while, but that was with water injection and eventually intercooling. The supercharger is capable of the RPM but the pulley is so small you're going to get wicked belt slip. I was forever fighting that and there's just no solution with only 6 ribs. I settled on a 2.625" pulley and ran that one until the end. I don't know if you've had the heads off, just want to say the factory gaskets are a weak point, especially between the 3-5 and 2-4 cylinders where they get hot. I ended up with Cometic on mine. My biggest concern would be detonation. The 1.6L compressor will make 9psi on a stock-cammed 350 with a pulley that small. With cast iron heads and no form of intercooling you should not attempt more than 7psi. That would be about a 2.75" pulley. Even then you'll need to watch for detonation closely and tweak the timing advance to prevent it.

Hey buddy,
Just curious but do you think I could run a 2.5 pulley on my whipple without water/meth injection? If not what kit do you reccomend for a daily driver 5.7 vortec whipple?

Specs are:
1997 Single cab pickup
5.7 vortec
whipple
36# wynjammer injectors
255 walbro pump
2 bar map
TR6 Plugs
Accel coil
8mm Wires
160 thermo
long tube headers
X-Pipe true duals
0411 PCM (BlackBear Tune)


I'm getting ready to put some electric dual fans and get it datalogged by blackbear

Thanks for any help