Gmpp cnc ls3 heads

[Trob85]

Wanting to know if anyone is running these. For what I'm looking to do this might be my best route. Running stock cubes with d1 Procharger making 900 hp. I know the boost will dictate the power but I don't need a super custom cnc job just a little more air flow to free up the n/a power so I can run less boost lets hear some pros or cons.





http://www.jegs.com/webapp/wcs/store...=&pgGrp=search

[meshamey]

What size cam.... seems like valve spring are not that good with

.550" max valve lift with installed springs

I had to go bigger with my cam

[Trob85]

I'm running the Lingenfelter gt9 cam I would just replace the springs with .675 prc set

[SPCBA]

west coast heads. if you want a custom port polish and mill job on the heads go to the best and do it once

[Trob85]

That's what I'm saying I don't need a custom porting job just a little more air flow which these have.

[429]

You're making 900 on a D1 on stock cubes and heads?

Uh, I'd like to see this setup... because I don't see it happening.

[litle88]

OP do you mean that you WANT to make 900hp and are looking for heads?

Tell me more about your setup, I'm curious too sir.

[Trob85]

You don't need a huge displacement to make big power several guys I know are running the same setup forged internal 376 ci ls9 cam ported heads full exhaust 102 octane making 875 to 910 hp at the crank not the wheels

[LS3 SS]

[litle88]

Originally Posted by Trob85

You don't need a huge displacement to make big power several guys I know are running the same setup forged internal 376 ci ls9 cam ported heads full exhaust 102 octane making 875 to 910 hp at the crank not the wheels

I know what it takes, just wanting to see the op's setup.

[Trob85]

That was ment for 429 stock crank Callie's h beams wiseco -11 pistons d1sc ported heads Aeromotive fuel system running e85 stock intake and throttle body long tubes with 3 inch straight pipe no cats.

[1977and2010]

I just put these on mine. Haven't driven it too much but does seem a little peppier ( if that's a word) for the little bit I have. I was on a time crunch to get my motor back together for a track day and went with these. One thing you will definitely need are the two rivets to plug the steam vents that will be at the back of the engine. I didn't realize this until I had mine all back together. And filling with antifreeze then started to hear the antifreeze dripping all over the place.

[Trob85]

What steam vents are you talking about the ones with that crossover pipe. Could you post up a picture.

[litle88]

Originally Posted by Trob85

What steam vents are you talking about the ones with that crossover pipe. Could you post up a picture.

He's talking about the steam vents. The Ls heads have a steam/ coolant tubes at each end of the head and there are freeze plugs at the back, one on each side. They must be plugged or used and connected back to the coolant system. I reconnected all of mine to avoid any hot spots in the head since I was going to have 12.25 to 1 compression. I used the L98 truck crossovers and then t'd it to the front ones.