L92 head dyno in GM High Tech
L92 head dyno in GM High Tech Great article on the dyno of the L92 heads versus cnc'd ls2 heads at Livernois.
The L92's which were not ported made 45 more hp than ls2 heads and they passed the ls2 in torque and hp at a lowly 2900 rpms. So much for the big fat ports not having enough "velocity" to make low end power. I do not believe the heads were milled so they were giving up some power due to lower compression. It is getting hard to justify a big block these days...and now the lsx block with a 4.25 bore...It is truely the golden age of hotrodding. I cannot wait to get mine on and drive them.
Chuck
The L92's which were not ported made 45 more hp than ls2 heads and they passed the ls2 in torque and hp at a lowly 2900 rpms. So much for the big fat ports not having enough "velocity" to make low end power. I do not believe the heads were milled so they were giving up some power due to lower compression. It is getting hard to justify a big block these days...and now the lsx block with a 4.25 bore...It is truely the golden age of hotrodding. I cannot wait to get mine on and drive them.
Chuck
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Originally Posted by ChucksZ06
Great article on the dyno of the L92 heads versus cnc'd ls2 heads at Livernois.
The L92's which were not ported made 45 more hp than ls2 heads and they passed the ls2 in torque and hp at a lowly 2900 rpms. So much for the big fat ports not having enough "velocity" to make low end power. I do not believe the heads were milled so they were giving up some power due to lower compression. It is getting hard to justify a big block these days...and now the lsx block with a 4.25 bore...It is truely the golden age of hotrodding. I cannot wait to get mine on and drive them.
Chuck
The L92's which were not ported made 45 more hp than ls2 heads and they passed the ls2 in torque and hp at a lowly 2900 rpms. So much for the big fat ports not having enough "velocity" to make low end power. I do not believe the heads were milled so they were giving up some power due to lower compression. It is getting hard to justify a big block these days...and now the lsx block with a 4.25 bore...It is truely the golden age of hotrodding. I cannot wait to get mine on and drive them.
Chuck
Stock shortblock/bottom end?? Intakes??
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Teching In
Joined: Aug 2006
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Luckily, got mine at the grocery store this evening... it's a great article.
I've been looking forward to finally reading about real-world results using the L92/L76 on an LS2. No milling, no fly-cutting, and correct me if I'm wrong, but the cam they used isn't that aggressive, is it?
232/236 @.050, .600 lift on a 112 LSA
I've been looking forward to finally reading about real-world results using the L92/L76 on an LS2. No milling, no fly-cutting, and correct me if I'm wrong, but the cam they used isn't that aggressive, is it?
232/236 @.050, .600 lift on a 112 LSA
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Post from LS1GTO.com
I just picked the new GM High Tech Performance at the store. They ran a comparison on an LS2 with the L92/L76 setup.
Here are some details from the article... hope you get to read it.
They started with a crate LS2 fitted with a stage II Livernois cam (232/236 @.050, .600 lift on a 112 degree separation angle), CNC'd LS2 heads w/ Kooks headers and a FAST throttle body, premium pump gas.
In that configuration they got 502.3hp and 465.3lb-ft of torque (this is at the crank measured by a Superflow 901 water brake dyno).
They swapped out the LS2 heads for a set of L92 heads that were straight out the box other than having upgraded valvesprings to accommodate the additional lift. They used the L76 intake with the included 39lb injectors. Dyno numbers went up to 546.8hp w/ 494.9lb-ft.
What I can't believe is that the heads were not milled, so the compression ratio dropped, and they still made more power with the L92's.
Is this the perfect setup for those of us looking for the ultimate NA "bang for the buck"? $1000 for the heads (pair), $500 for the intake, fuel rails and injectors. Throw in the headers, tune, cam, and get almost 500whp? Sounds pretty damn good to me... anybody else?
I just picked the new GM High Tech Performance at the store. They ran a comparison on an LS2 with the L92/L76 setup.
Here are some details from the article... hope you get to read it.
They started with a crate LS2 fitted with a stage II Livernois cam (232/236 @.050, .600 lift on a 112 degree separation angle), CNC'd LS2 heads w/ Kooks headers and a FAST throttle body, premium pump gas.
In that configuration they got 502.3hp and 465.3lb-ft of torque (this is at the crank measured by a Superflow 901 water brake dyno).
They swapped out the LS2 heads for a set of L92 heads that were straight out the box other than having upgraded valvesprings to accommodate the additional lift. They used the L76 intake with the included 39lb injectors. Dyno numbers went up to 546.8hp w/ 494.9lb-ft.
What I can't believe is that the heads were not milled, so the compression ratio dropped, and they still made more power with the L92's.
Is this the perfect setup for those of us looking for the ultimate NA "bang for the buck"? $1000 for the heads (pair), $500 for the intake, fuel rails and injectors. Throw in the headers, tune, cam, and get almost 500whp? Sounds pretty damn good to me... anybody else?
Teching In
Joined: Aug 2006
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Just to clarify, I keep reading the article, and I think the baseline 502.3hp run was with the stock LS2, stock heads(not CNC'd), and the Livernois cam.
Point is that they picked up 44hp by going to the L92/L76 from stock LS2 heads/intake.
Point is that they picked up 44hp by going to the L92/L76 from stock LS2 heads/intake.
That is awesome! I can't wait to finish my
twin turbo L92 this winter.
Even at low boost these things should be capable
of some impressive numbers for very little $.
Has anyone out there used the L92 heads on a FI application yet?
twin turbo L92 this winter.
Even at low boost these things should be capable
of some impressive numbers for very little $.
Has anyone out there used the L92 heads on a FI application yet?
Teching In
Joined: Aug 2006
Posts: 10
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Originally Posted by Nate_Taufer
Did they put the heads on a stock LS2?
Nate
Nate
Neat stuff...
Originally Posted by Zach@Texas-Speed
Those are great gains for out of the box heads!!
Imagine the gains with a set of the PRC CNC L92 heads for 1499.99
Imagine the gains with a set of the PRC CNC L92 heads for 1499.99
Will you be doing any long block assemblies with the new CNC L92 heads, and your 418ci L92 stroker short block?