pHEnomIC

iTrader: (14)

I have a 404 ls2 with stock ls1 heads and torquer v3 cam. I was wondering how much power and torque would I be picking up switching to some l92 heads. I believe my current compression is 11.5, if thats gonna change.

I want to know compared to l92s, how would other heads compare in the 1000,2000,and 3000$ range.

Pewter53

iTrader: (36)

The l92 heads are far superior to the stock ls1 heads but I coulnd not give you an accurate estimate of the difference. You maybe better off getting some ported l92's for a 404 ci motor those would be killer. Check out the for sale section there are some some ported l92's for sale I think blacksheep has them. I would easily say you would gain 50hp or more from the ported l92's maybe even stock ones.

3timeracin

iTrader: (15)

Its hard to say what you would pick up without you current numbers ? with L92's you need the complete package for them to work. The right cam, good headers and compression, But no need for ported L92's on a 404 they flow 320+cfm you would have to spin that 404 about 7,400 rpm's to use all that flow and most porting hurts the low lift numbers a little. There are several guys over on LS1GTO running the unported L92's on the 6.0 and making nearly 500rwhp. I think if you run the L92 heads and intake a 228/240 114 cam with some good rocker arms and mill the heads to keep your compression you will easily make 470+rwhp

mike c.

iTrader: (1)

I run the ported l92's,stock l76 intake w/g6x3 cam on a 402ci and got 517hp 468tq. The car runs high 10's n/a at 3,700lbs.

3timeracin

iTrader: (15)

On a stick car yes on a stalled A4 517rwhp with that is imposible. Thats what I had on my 05 gto originally was stock L92's I cleaned up a little with a 236/248 cam 4,000lbs 10.80's all day made 486rwhp

davidws6

iTrader: (36)

Why spend all the cash ?

I put on some ol hand ported 317's with stainless valves on a 402.

It popped 482 RWHP with a 231/237 +2 cam on a 115LSA and the tuner did not know WTF he was doing as he was a stang freak.
I then put it in a SD tune and it's SCARY ! Have not dyno'ed it after.

Bang for the buck ? Well for me the ol 317's shine on a 400 ci engine.

It has the FAST 90/90 on it with 3.42 gears.

mike c.

iTrader: (1)

3TIMERACING- Any video of that gto? What was the 60foot and mph of that car to run 10.8 at 4,000lbs? Who's cam grind was (sponsor)? My bud has a 05 gto and would like some info on yours.

Pewter53

iTrader: (36)

yeah they flow good on the intake but the exhaust is not that great on them hince why you have to use such a wide duration split.

Pewter53

iTrader: (36)

who did the tune ?

davidws6

iTrader: (36)

The original tune was done at www.supertuneracing.com in Overland park, KS. (Kansas City) in August 2005.

The Speed Density tune was done by Soundengineer ( Scott Evans, Kansas City but now in the Dallas area ) . I've tweaked the tune since as the AFR was lean in some areas.

The heads were done by,

New Kid Cylinder Heads ( Jim Duncan )
1029 Southeast Claremont Street
Lees Summit, mo 64081-3763

3timeracin

iTrader: (15)

I'm not big on dyno #'s or videos I run at lebanon valley by Albany, NY. (I have had guys come up to me and say hey my car has 5xxRWHP with only stock heads or my car made xxxrwhp then they continue to run a 12.40 ?) So to me numbers mean nothing without times to back it up! I worked at west Tech for a while and did alot of testing on the LS engines for Comp and others alot of my work I do myself as the cams run and I do alot for my freinds. There so many variables on a dyno you can mess with the strain gauge and other things to make numbers inflated. My car now has a front mount pt88 on it with a 418 I sold it to guy in NJ I think he is selling it now.

The same engine combo in a 2006 GTO A6 made 534RWHP with a SD tune. The loose converter and et streets on had on the car really throw the dyno numbers off.

3timeracin

iTrader: (15)

The 60' was a 1.52 and the MPH was 125.6

RyanSws6

iTrader: (72)

I picked up 20+ hp over CNC ported LS6 heads. It would be more if I hadn't run out of fuel at 5800. I would've had more if I would've had another 1000 rpm and only one run maybe 30hp over the patriot heads.