L92 Heads
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Melting Slicks
Joined: Oct 2006
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L92 Heads
Can anybody tell me what the avg. HP gain from a set of GM L98 heads on a stock LS2 would be? I got some info in a GMHTP mag today and could'nt see where the performance gains were in laymans terms. I understand they flow better, but whats the bottom line for Hp over stock?At $400.00 a piece fully assembled, it's a great piece if it shows some gain over base.
Drifting
Joined: Jun 2002
Posts: 1,682
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Originally Posted by Evilways
Can anybody tell me what the avg. HP gain from a set of GM L98 heads on a stock LS2 would be? I got some info in a GMHTP mag today and could'nt see where the performance gains were in laymans terms. I understand they flow better, but whats the bottom line for Hp over stock?At $400.00 a piece fully assembled, it's a great piece if it shows some gain over base.
Thread Starter
Melting Slicks
Joined: Oct 2006
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Originally Posted by xstang
I think the article in GM high tech said they gained 42-44 over a stock LS2 heads and ls2 intake. (l98 heads and L76? intake)
Thread Starter
Melting Slicks
Joined: Oct 2006
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Originally Posted by Brasil
I was under the impression by many posts here that the L92 heads would not fit the LS2 because of differences in the Bore size? The new intake will not fit either, I was told?
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Advanced
Joined: Sep 2005
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From: Fresno California
Originally Posted by Brasil
I was under the impression by many posts here that the L92 heads would not fit the LS2 because of differences in the Bore size? The new intake will not fit either, I was told?
BTW there L92 heads.
Heel & Toe
Joined: Aug 2003
Posts: 22
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From: Galesburg IL
There are only so many combinations that you can cover. I think that they wanted to show the potential of the L92 heads. Most people change cams when they do a H/C/I type swap.
In the future we will be testing as many cam combinations as possible. We will also test with the several of the "stock" cams such as the LS2 vs the LS6 etc.
Robin
In the future we will be testing as many cam combinations as possible. We will also test with the several of the "stock" cams such as the LS2 vs the LS6 etc.
Robin
Thread Starter
Melting Slicks
Joined: Oct 2006
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Originally Posted by Robin Lawrence
There are only so many combinations that you can cover. I think that they wanted to show the potential of the L92 heads. Most people change cams when they do a H/C/I type swap.
In the future we will be testing as many cam combinations as possible. We will also test with the several of the "stock" cams such as the LS2 vs the LS6 etc.
Robin
In the future we will be testing as many cam combinations as possible. We will also test with the several of the "stock" cams such as the LS2 vs the LS6 etc.
Robin
Instructor
Joined: May 2000
Posts: 181
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From: AV MN
Originally Posted by Evilways
Right...I understand that, but if I'm gonna put cash on an upgrade, I want to know what to expect, like whats the avg gain from these heads on a bone stock car?
Instructor
Joined: Apr 2005
Posts: 129
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From: Charleston SC
Cam swap with stock heads would net a much larger gain. In general with the lsx motors, changing heads with stock cam nets little gain for the dollars and effort in the swap. I swaped from Ls1 heads to ported and polished ls6 heads with a stock cam on an ls1 and realized only 15 hp gain. A big downer for approximately 1400 and 20 hours of knuckle bustin' effort. I dont know all the details with the L92 heads, but I doubt that the gain would be proportionally more over stock LS2 heads than from ls1 to LS6 P&P... Just my 2 cents, but take it from me, don't learn the hard way that a head swap in isolation is likely to be a big disappointment. BTW- added a "moderate" cam after the heads and found another 50HP. Bottom line- if you're going to crack open the engine, change the cam too!!
Former Vendor
Joined: Aug 2004
Posts: 1,849
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Originally Posted by Scott 98Z M6
I'll be using a L92/L76 intake combination on my APS TT car on the stock LS2 shortblock. I dropped the stuff of at West Coast Cylinder Hears last Friday!
I'll post numbers when I get them.
I'll post numbers when I get them.
Peter
Burning Brakes
Joined: Feb 2006
Posts: 903
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From: Miami FL
If money is no object, I'll still take a set of AFR 205/225's. Yeah the gain was around 40hp. How much of that was from the intake? If it was 10-15hp then you are really bolting on 25-30hp. And that power is rated on an engine dyno. The net gain.....28-30whp gain from head swap. Not bad for the money, but I think it wouldn't be ideal with most setups.
dougie
dougie