L92 Heads
Drifting
Joined: Nov 2002
Posts: 1,651
Likes: 125
From: laguna niguel ca
They may be a little more $ than you think
With my cam 224/228, and FAST 90 etc, I was making 425/405.
After the 215 ET heads, made 461/435. So, That's 36hp&30tq with just the addition of the heads. Talking to Andy Green @ A&A, He's got some sets of them and is working with them now. Asking him about those heads, His remarks were; A good starting point. They need some clean up work, good set of duel springs, the valves are cheap,and I'm not sure but I think you're going to need some off-set rockers. And there not cheap. So they may start out as a bargin, but to get them ready to work on a performance car, not a truck as they were intended, is going to drive the price up to where all of the other heads like ET's,AFR's and the rest are. I don't really think GM is going to put all of the other aftermarket head people out of business. I'm not knocking these heads, I think there good and when these head people get through working there magic they just may be the latest great mod for these LS2 motors. MY .02 cents
andreas G.
After the 215 ET heads, made 461/435. So, That's 36hp&30tq with just the addition of the heads. Talking to Andy Green @ A&A, He's got some sets of them and is working with them now. Asking him about those heads, His remarks were; A good starting point. They need some clean up work, good set of duel springs, the valves are cheap,and I'm not sure but I think you're going to need some off-set rockers. And there not cheap. So they may start out as a bargin, but to get them ready to work on a performance car, not a truck as they were intended, is going to drive the price up to where all of the other heads like ET's,AFR's and the rest are. I don't really think GM is going to put all of the other aftermarket head people out of business. I'm not knocking these heads, I think there good and when these head people get through working there magic they just may be the latest great mod for these LS2 motors. MY .02 cents
andreas G.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Part of the gains seen in testing these heads were had by comparing the stock heads and the LS2 manifold with the L92 heads and l76 manifold. The swapping of manifolds may have been a good chunk of the gains. Head cam guys got 20-27hp from the FAST and the test of the heads used a big cam. There is always a great combo to be had but I would stick with what is proven.
Early tests of the L92 heads on a 403 yeilded 480rwhp....no great feat in light of the big cam used.
As always there is lots of talk and little proof.
With a 236 cam trickflows have shown over 500to the wheels more than once. Look there instead of trying to reinvent the wheel or get it for 1/2 price.
L92's need springs, milling, intake manifold, valves, rocker, and clean-up port work. The tests all show no low end gains under 2900rpm. The lower DCR can acount for some but not nearly all of the low end losses. I suspect there will be a smaller chamber version and a better intake manifold for this style head in the future when it makes its way into a corvette. The likely comparison will be the 6 liter truck head vs the 243 casting. They used most of the same specs but had different combustion chambers.
Early tests of the L92 heads on a 403 yeilded 480rwhp....no great feat in light of the big cam used.
As always there is lots of talk and little proof.
With a 236 cam trickflows have shown over 500to the wheels more than once. Look there instead of trying to reinvent the wheel or get it for 1/2 price.
L92's need springs, milling, intake manifold, valves, rocker, and clean-up port work. The tests all show no low end gains under 2900rpm. The lower DCR can acount for some but not nearly all of the low end losses. I suspect there will be a smaller chamber version and a better intake manifold for this style head in the future when it makes its way into a corvette. The likely comparison will be the 6 liter truck head vs the 243 casting. They used most of the same specs but had different combustion chambers.
