Basically building a pair of intercooled 600sc clones looking for actual hard numbers on what everyones running for pullies and what the psi is with them.

Stock 600sc pulley ratio was .93:1 or basically 7% underdrive. I believe on the 600sc, it made about 5-6psi.

I guess ill watch my guages close and make bigger pullies if it comes down to it.

You got the 16 Rib pulleys right ? Teague and blower shop have them in different sizes.

Can you get the exact measurments of the pulleys you got now top and bottom

Ya. 6.3125 drive and 5.375 top which comes out to 17.442% overdrive

i have a pair od 600 sc..i put prochargers on them,,i still have the stock 10 rib lower
pullys ill give you a deal on,,but it looks like you may have the aftermarket 16 rib

Yes they're 16 ribs