TESTOSTERONE C6-R

Just order the complete GM Performance L92 Cylinder Heads and L76 Intake with #40 Injectors and TB(90mm),etc... Should have them by next week and installed withing 2 weeks.
I also order 3" C6 Z06 Kooks(JET COATED) to go with the "D" shape exhaust ports. NOW...

WHACHA GOONA DOOOO WHEN THIS SET UP RUNS WILD ON YOU!!!!!


Will post Dyno numbers once completed.
Hoping over 400 RWHP

You guys think since I am using the factory cam I should keep the springs that come with the L92 heads? They are good to .510 lift or can I swap my factory springs? Whats the max for the factory C6 springs? I know a cam will provide more power but dont whant to go there yet...I heard of these set up giving over 400RWHP with the factory cam.
I also have a GM Performance exhaust system(off-road) that might need a flange to weld to the 3" exhaust or should I get the Z06 muffler and sell the GM Performance Off-road exhaust (2.5") I love the sound of them but, what you guys think.
Any input will be greatly appreciated.

aTX427

Did you order the kit that comes with the entire top end? What is that GMPP part number?

cbrf4i1

yes, you will get over 400rwhp without a doubt. either valve spring should be ok with the stock c6 cam.

Fore58

How much are the parts?

TESTOSTERONE C6-R

L92 Complete assemble
Part # 12582713
Aluminum Performance Head
Higher Flow than cathedral port LS heads
D-Shaped Exhaust Ports
2.16 Intake Valves
1.59 Exhaust Valves


L76 Complete Intake Manifold
Part # 12590123
Fuel Rails
Intake manifold
40lbs Injectors
90mm TB

also need
Part # 12569167 (8)
Part # 12600936 (2)
and the head gasket and new bolts.(ANYBODY GOT THIS PART #?)

Its been 2-3 days researching the benefits and all parts need it for this GM performance parts. Trust me It felt like I took a class on all this heads,intakes,cams,etc,etc.....you may port this if you got the greens and add cams and more but I really think this set up will work really good for the money.


You can find more info in
www.gmhightechperformance.com or
www.gmperformanceparts.com
www.gmpartsdirect.com or
www.slponline.com have a complete kit also.

SpinMonster

Use cometic .033 head gaskets to maintain the 10.9:1 cr ratio.

SPDC has them or

www.cometic.com

Pontiaker

Man do a mild cam with this combo and you will be pushing 460 at the wheels...

Evilways

Be sure to check your parts over well before install...I got mine in today and one head has a gouge and the intake's firewall side is broken The company is making good on it,though

SpinMonster

The GM high performance tests with a 232/236 cam showed 465rwhp with some losses in low end TQ at 3k-3.5k. Some can be attributable to the lower compression.

cmb13

Driver_WT

What does the torque look like under the curve (other than at 3k to 3.5k)?

BC Bob

Evil,
Let me know how the L-92's perform. Jeff is on the fence about L-92's and I'm looking for something to replace my 799's.
Thanks.

TESTOSTERONE C6-R

FOR LS2 OR L92 HEADS?

andreas g.

Your stock L92 heads are not 66cc chambers. Your going to dump your compression to under 10:1. These heads are found on the escalade which runs on 87-89 octane. You should dissasemble them and have them milled to bring the compression up to your stock LS2 numbers. Then why not at least put the 918 comp springs on. I would go with a duel spring myself. Since you're going through this exercise think about putting at least the 224/228/581/588/114 comp cam in. You woun't regret it. After the install, you'll need to check your pushrod length since milling the heads, to get the right valvetrain geometry. Don't mean to rain on your parade, but you need to address these items, if you want your project to turn out the way you want it to. I'm using these head on my stroked L92 motor. They have been CNCported and milled. In there present form they flowed 360cfm intake and 280 cfm exhaust. In there stock form they flow 332cfm and 189cfm @ .600 lift.
This is why you need some cam improvement to fully realize the heads potential. In my motor, using a somewhat small cam for a big inch motor, 232/234/595/598/112LSA's I'm making 525rwhp/500rwtq, and it's a daily driver. Hence the use of the street type cam. Think about your project and make good choices. You'll be happier at the end.

Evilways

I'll be sure to post the results. I'm thinking I'll gain moe torque than HP, but anything over 440-450 rwhp I'll be happy with.

LS1LT1

BC Bob

Question from a 799 novice: If you are required to do all that work to the L92 head, why change from the OEM 243? What makes the L92 head that much better?
Since I'm so down on power, I'm pretty well convinced that I also need to change heads when I install a cam. But which head is the question?
I like the price of the L92's. Less than half the price of AFR 205cc Mongoose heads. But if I need to do all that work to the L92, plus buy a compatible intake, is it really worth it?

valdeztke

Would that make these a nice addition to a centri SC setup?

Evilways

The GMHTP article was the first of it's kind, and some really valuable info was in there. I havent seen anything since to make me want to go out and mill the heads before install. The lower end loss was minimal compared to the gains in the upper rmp band. The most dramatic loss was at 2600 rpm . Stock was 393.5HP and 194.8 TQ, L92 was 387.6HP and 191.9 TQ. The L92 start out performing at 2,900 rpm all the way to 7000 rpm. GM has mentioned that they will offer a cnc'd version of the L92 later on, but with minimal increase in flow and performance. To put things in perspective, the test engine they used for the "stock"L92 had a mild cam and provided 494.9 ft lbs tq at 5,000 rpm and 546 HP at 6500 rpm.Not bad for an engine with a 232/236 cam and headers on an engine dyno.

TESTOSTERONE C6-R

Here is a direct link of the GM performance Tech talking about the L92 Heads

http://videos.streetfire.net/video/b...c800d7d064.htm