bdickey058

Just had a new bottom end built for my c6z with d1sc.Went with a lsx 427 lsx block, Diamond pistons, magnum crank. Running e85 and stock ls7 heads. Just got it back from the shop and it's making 820 and 740. Vehicle seems to run fine but it's only making about 8.5-9psi on a 8 rib. Compression is 10:1 btw.

bdickey058

Shouldn't it be making more boost? I think I have a 3.5 pulley on it too

Mike Farris

8" crank?

Detoxx03

Have a graph? Let's see where it's making power at.

Nino S

Depends on the lower crank pulley. I have a 10" lower. 4.5" upper and see 21 psi with my F1X. With a 3.5 upper I have a feeling you are running a 8" lower or have a boost leak somewhere.

bdickey058

I believe a 8 inch crank pulley. I'll take a pic of the graph when I get off work.

neverstop

with 8" crank and 3.55" blower pulley I'm seeing 15psi peak boost on my LSX block 427 with custom blower cam and ported MAST 305cc heads, 9.75:1 compression, 91 pump gas with dual methanol, ~900whp 860tq

bdickey058

820rwhp 740rtq<br/>Ati super damper, prochargers 8 rib upgrade kit, 427 lsx, 10:1 compression, arh, billyboat exhaust, e85. <br/>Car is making about 8.5psi. Not sure what size pulley is on it.

bdickey058

You have to look closely to see the torque curve. It printed light.