SSInnovations

iTrader: (8)

Can I run 63cc heads on a stock 98 + boost?

98 SS
LS6 intake
Ported TB
Kooks LT's
Stock cam 198/209 .500/.500 119.5
Ls6 oil pump
Comp push-rods
Katech rod bolts
D1SC 6-rib w/ belt wrap mod - Twin IC 3.7" pulley

I am just trying to keep everything together until I can afford a forged shortblock and was wondering if a set of heads I have would be crossing the line. They have 63 cc chambers, full cnc, and enlarged intake/exhaust valves. I was thinking of leaving the cam stock to choke it out a little, but am afraid this is still a recipe for a busted motor, compression will be a little higher than ls6 heads. Also, I'm not sure what kind of boost the 3.7" pulley will be giving me. Would love some opinions, power goals only 550

I8UR4RD

iTrader: (16)

those would be fine. you could always sell them or trade them for a set of 317 heads. grab some arp bolts or studs, and get a damn good tune. keep the boost low and enjoy it at that level while you save up for the forged shortblock. would like to also steer you in the direction of ERL, Kurt Urban, and AES when that time comes.

SSInnovations

iTrader: (8)

Kind of stuck with the heads. I bought them used and the guy hosed me, they were damaged. Since the cost was already sunk I had them repaired, I might as well run them.

Any idea what that 3.7" pulley is going to put out?

JRENIGAR

iTrader: (37)

Thats one way to look at it but on the other hand, how bout trading them for some 317's and kill two birds with one stone. The lower cr would allow more boost and 317's flow as good as 243's or 799's so I hear. Boost makes more hp than compression on a FI motor.

milleniumm6z28

iTrader: (1)

not sure how your cam will effect it but im running lpe ls6 heads that are cnc bigger valves and are 62cc with a stock bottom end only difference is i have a big cam... i running a 7.625 crank and a 4.38 bp that puts me at 10 psi at 6500

Tirefire

iTrader: (1)

That pulley is a pulley away from maxing out the blower. You might want to change out that pulley for a smaller one. It's best to keep the block at 8 lbs. of boost with stock internals. Get a 4.15 pulley should put you 8 lbs that's with a 7.65 crank pulley if I'm not mistaken.

Tirefire

iTrader: (1)

I drove around with that setup for a few years put down 525 rwhp and 511 rwtq.

white01ss

iTrader: (37)

I was making 10 psi with a 7.25/4.25 pulley combo for a year on stock long before the motor let go. Made 540/500 on it. Run water/meth for insurance to keep the heat down and tie in the rear steam ports so you don't pop #7 like I did. Some folks stock lower's last for years on boost, others pop'em on the dyno before leaving the shop.

milleniumm6z28

iTrader: (1)

Yes meth is a good investment that and make sure you have someone who know what they're doing tune it

SSInnovations

iTrader: (8)

?

Pulley is actually a 3,6" (I hadn't looked at it in months), crank pulley is 6" however. Where do you guys think this this puts me?

Also, I am setting up for E85 if that matters.