GM 12626958-LSA heads
12-29-2010, 12:17 PM
#1
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GM 12626958-LSA heads Just wondering if anyone has any experience with these heads... Alot people seem to want to run the L92, but are afraid of the thin decks, wouldnt these be the "answer" from GM for boosted economical heads at about $450 each that would be able to hold boost??? Any thoughts??
12-29-2010, 12:21 PM
#2
Just wondering if anyone has any experience with these heads... Alot people seem to want to run the L92, but are afraid of the thin decks, wouldnt these be the "answer" from GM for boosted economical heads at about $450 each that would be able to hold boost??? Any thoughts??
12-29-2010, 12:38 PM
#3
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Here is a write up I found about them.....They seem better than the standard L92/LS3
"The 6.2L Supercharged LSA cylinder heads are similar to those used on the naturally-aspirated 6.2L LS3 Corvette V-8, with enhancements for supercharged induction and maximum durability.
The LSA heads feature a unique “wing” cast into each intake port to promote a swirling motion that blends the pressurized air-fuel charge. The heads are also cast from a premium A356-T6 alloy, which better manages the heat generated in a supercharged engine. A356-T6 pays particular dividends in the thin bridge area between the intake and exhaust valves, where effective heat dissipation is crucial to both performance and long-term durability. Finally, the LSA heads are rotacast. This process rotates the head mold as the molten alloy cools and essentially eliminates porosity, or microscopic pockets of air trapped in the casting. Rotacasting delivers a stronger part that helps maintain performance and structural integrity over the life of the engine"
"The 6.2L Supercharged LSA cylinder heads are similar to those used on the naturally-aspirated 6.2L LS3 Corvette V-8, with enhancements for supercharged induction and maximum durability.
The LSA heads feature a unique “wing” cast into each intake port to promote a swirling motion that blends the pressurized air-fuel charge. The heads are also cast from a premium A356-T6 alloy, which better manages the heat generated in a supercharged engine. A356-T6 pays particular dividends in the thin bridge area between the intake and exhaust valves, where effective heat dissipation is crucial to both performance and long-term durability. Finally, the LSA heads are rotacast. This process rotates the head mold as the molten alloy cools and essentially eliminates porosity, or microscopic pockets of air trapped in the casting. Rotacasting delivers a stronger part that helps maintain performance and structural integrity over the life of the engine"
12-29-2010, 01:49 PM
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LSA does have the MLS gaskets, but stock GenIV diameter head bolts. That funky air wing ends up being a restriction as boost and power increases.
12-29-2010, 05:41 PM
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At what power level would this occur??? Depending on what level the wing becomes a problem it seems like it would be a superior head compared to the L92 due to the extra head thickness and the rotacasting
12-29-2010, 06:08 PM
#7
I went from L92s to a set of LSA's to try
I got a new set ported from Richard at WCCH
It uses a better material and better casting technique than the standard L92
LSA's use the normal LSX head bolt diameter
I can tell you the castings look WAY nicer than my old L92s
Just look how nice the as cast chambers are...
No one really knows if the decks are actually thicker or not, they do have more heft in other areas though like the intake flange
If anyone wants to try a set i have a pair that have maybe 10 miles on them i picked up from See5 (bruce) on Tech that i would sell for cheap
I bought them and then just decided to buy a fully ported set from WCCH instead of waiting to send those in
I got a new set ported from Richard at WCCH
It uses a better material and better casting technique than the standard L92
LSA's use the normal LSX head bolt diameter
I can tell you the castings look WAY nicer than my old L92s
Just look how nice the as cast chambers are...
No one really knows if the decks are actually thicker or not, they do have more heft in other areas though like the intake flange
If anyone wants to try a set i have a pair that have maybe 10 miles on them i picked up from See5 (bruce) on Tech that i would sell for cheap
I bought them and then just decided to buy a fully ported set from WCCH instead of waiting to send those in
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12-30-2010, 09:55 PM
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I spoke to Richard today and ordered a set of worked LSA heads for a project. He said they flow close to the same but the LSA was a better material and you can get a bigger combustion chamber out of an LSA (75cc) vs. a L92 (72cc). All depends on your needs.
01-23-2011, 10:34 AM
#12
Wow 75cc chambers?? Thats enticing for me switching from a 11.2:1 CR n2o 62cc setup trying to get to a more boost friendly sub 10:1 CR! I didn't realize anyone made anything bigger than 72cc. Any idea what kind of power these would support on a 402?
01-23-2011, 01:48 PM
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I'm putting mine on a 408 (10.4:1CR) in my Tahoe. Topping it off with a TVS2300. Hoping for 12-15psi. We will see what I can do with my less than boost perfect CR. Meth injection is already in the garage if needed.
01-23-2011, 08:50 PM
#15
Cant wait to hear how they do! Just be sure to tune without the meth and then just use it for more power beyond it. I've heard too many horror stories of tuning FOR the meth setup and a pump fails and kaboom! bye bye motor!! I wanna use meth too but not rely on it. Eventually when the motor needs to be freshened up i'll have it built boost friendly all the way. Good luck!!
