L92 head dyno in GM High Tech
Teching In
Joined: Aug 2006
Posts: 10
Likes: 0
Here are the dyno graphs, as well as the flowbench measurements for the L92 (my apologies if the quality isn't that great - taken with digital camera and shrunk - I think it's legible - hope its okay to post)
L92 flow numbers and dyno for the stock LS2 w/ cam
And here is the L92
L92 flow numbers and dyno for the stock LS2 w/ cam
And here is the L92
So the L92's were compared to STOCK LS6/2 castings, not CNC ported ones. I wonder how much the LS2 manifold hurt? A LS6 manifold with the TPIS 90mm conversion would be a better manifold than the LS2 for testing the LS2 heads. Nice to see a test though.
Originally Posted by camarols1
Has anyone out there used the L92 heads on a FI application yet?
Originally Posted by Beast96Z
I wonder how much the LS2 manifold hurt? A LS6 manifold with the TPIS 90mm conversion would be a better manifold than the LS2 for testing the LS2 heads.
Originally Posted by 11 Bravo
Word. The L92 is outstanding and clearly the winner, but put a 90mm setup on the LS2 heads and the results would be much different. The LS2 manifold is horrible.
Guys these heads are already good... if you want a good cheap set get someone who knows how to put a good valve job in them and go with that, amybe tuned up the exhaust port, but unless you want to do the intake port correctly the early "cheap" port jobs are going to be crap. It's easy to make these things into scrap by porting them the wrong way.
Bret
Bret
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Originally Posted by Wnts2Go10O
not 42hp horrible though.. i would think if the l92's were milled to match the stock compression there wouldve been maybe 10 more hp.
Originally Posted by mike c.
wow,glad to hear it. i already have l92 heads and they are being ported for my 402ci that will be in my car this spring. 
Originally Posted by SStrokerAce
Guys these heads are already good... if you want a good cheap set get someone who knows how to put a good valve job in them and go with that, amybe tuned up the exhaust port, but unless you want to do the intake port correctly the early "cheap" port jobs are going to be crap. It's easy to make these things into scrap by porting them the wrong way.
Bret
Bret
While putting together a 408 shortblock today, I put on an L92 head with LS7 valves in it. 1. It all fits. 2. There seems to be at least .080 clearance between the valves and cylinder walls. 3. LS7 valves are light as hell and only around 1k, I figure 35+ grams lighter than a S.S. hollow stem.
Thoughts anyone???
Those are some damn good results. Stupid ******* Books a million hasn't had the past two editions so I've missed out some. Hopefully they'll start stocking them again.
Originally Posted by 2c5s
While putting together a 408 shortblock today, I put on an L92 head with LS7 valves in it. 1. It all fits. 2. There seems to be at least .080 clearance between the valves and cylinder walls. 3. LS7 valves are light as hell and only around 1k, I figure 35+ grams lighter than a S.S. hollow stem.
Thoughts anyone???
Thoughts anyone???
Bret
Staging Lane
Joined: Aug 2006
Posts: 91
Likes: 0
From: under the hood
Originally Posted by SStrokerAce
The LS7 valves are a liability that you are rolling the dice with.... ask a number of shops who work with them regularly. LG, HPE, Katech.... most will replace the valves in the heads with better aftermarket versions. They aren't cheap though at well over $100 a valve, works out to be $1000 or so a set.
Bret
Bret
LS1Tech Sponsor
Joined: Feb 2006
Posts: 1,170
Likes: 1
From: Rockfield Kentucky
Originally Posted by LSX Wizard
Curious why you'd claim the Ti LS7 valves are a liability? Del West makes them, and they are certainly well known in the aftermarket world for Ti valves! Please explain.
I was wondering the same thing...... Mine have Del West logo on them. Del West has been making trick valves for race engines for years.
Robin
i just read that article and it is suprising that they only had a 4* spilt where as the net is saying a 10* spilt is in favor. but looking at the graph the cam they used made some good numbers on a 6.0. makes you wonder if a typical ls cam could still be used to make good power