GM CNC L92 Head Results!
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Joined: Mar 2002
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From: Lubbock, TX
GM CNC L92 Head Results! Ok, we did a back to back swap on the engine dyno. The engine is our L92 427. We were running an L76 intake, box stock. The only change made between graphs was the heads themselves! We not only put the HP and FtLbs figures, but highlighted the difference between the runs in yellow for easier reference. 
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Thread Starter
Joined: Mar 2002
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From: Lubbock, TX
It was a 4.068" bore, 4.1" stroke. And yes, this was a stock valve!
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Any hint of what they did below 4500 rpm? I know everyone is going to say that they never spend anytime at all below 4500 rpm because during drag racing it never goes below that, but I was just curious what they did at lower rpms.
Thanks.
Thanks.
Great gains. Was the combustion any smaller on the CNC heads (yielding a higher static compression)?
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Thread Starter
Joined: Mar 2002
Posts: 3,523
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From: Lubbock, TX
No sir, they have the same size camber as the standard L92 heads!
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Makes it all the more impressive if the bowl was untouched near the valve. BTW, does your CNC program work more on the intake or the exhaust? Is this considered your top program or do you have a more intensive one?
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Thread Starter
Joined: Mar 2002
Posts: 3,523
Likes: 35
From: Lubbock, TX
We do not CNC these heads here...all of that is contracted by GM. It does not appear that much if any change has been made to the combustion chamber. This CNC head focuses more on the intake port than the exhaust for sure!
I'm not sure which 427 these tests were done on.
I'm not sure which 427 these tests were done on.
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Ok, we did a back to back swap on the engine dyno. The engine is our L92 427. We were running an L76 intake, box stock. The only change made between graphs was the heads themselves! We not only put the HP and FtLbs figures, but highlighted the difference between the runs in yellow for easier reference.
not a good choice for a street car looking for low rpm torque... yet with a nice NA converter for the strip.. or nitrous converter this should make some serious mph power for the track. who doesnt want a 4500 stall at the track?
