L92's on a turbo car?
Haha....yeah they do...tryin my hardest to keep her stock but its hard.
cam wise...its a traditional split 238/246 on a 117lsa. here's an idle vid:
http://www.youtube.com/watch?v=g8gRCx8_fs0
cam wise...its a traditional split 238/246 on a 117lsa. here's an idle vid:
http://www.youtube.com/watch?v=g8gRCx8_fs0
Damn these heads seem to just work when turbocharged regardless of reverse or traditonal split.
Wierd
. its also a M6 car with a stock rear right now so that helped a little. Veee8 is going through a th400....so im sure he'd be putting down a ton more if it were a m6 and stock rear like mine..lol.
The real reason I had these heads ported was that I was a bit disappointed with how they came out of the box. I got 2 sets, a year apart,and they were all the same. All full of slag and imperfections, and all the machined surfaces were way rough, including the decks. The WCCH treatment made them a lot nicer. I don't see how they could have sealed with how rough the decks were, but maybe???
. I bet both of those cars are useless in first gear on the street.
Not trying to say yours is low on power, I am just saying I am impressed with how these L92 heads respond to boost, they make great power no matter the boost or (it seems) no matter the cam design. I plan to copy what you have done, except on stock L92 heads (maybe cleaned up by hand) one day in the future.
I bet both of those cars are useless in first gear on the street.
I bet both of those cars are useless in first gear on the street.
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Verdad Gallardo What? No, of course not. The last sale I saw had stock unassembled L92 heads for $220, assembled for $475. CNCd are way more expensive.
But the as cast ports should at least be even and not full of casting flash. If GM concentrates on making a top quality mold, the as cast ports will be fairly smooth and consistant.
But the as cast ports should at least be even and not full of casting flash. If GM concentrates on making a top quality mold, the as cast ports will be fairly smooth and consistant.
I have used several different online calculators for CR. Static comes out to 9.5-9.8 depending on which one you use.
Original thread is here... some things have changed from then....
https://ls1tech.com/forums/forced-in...tml?highlight=
First startup...
https://ls1tech.com/forums/forced-in...tml?highlight=
Dyno results here.....
https://ls1tech.com/forums/forced-in...tml?highlight=
What? No, of course not. The last sale I saw had stock unassembled L92 heads for $220, assembled for $475. CNCd are way more expensive.
But the as cast ports should at least be even and not full of casting flash. If GM concentrates on making a top quality mold, the as cast ports will be fairly smooth and consistant.
But the as cast ports should at least be even and not full of casting flash. If GM concentrates on making a top quality mold, the as cast ports will be fairly smooth and consistant.
Bang for the buck, they are great heads though! Maybe when we start really shoving air in them we'll have issues with the "thin deck" but so far I can't say that its been a problem, and we've had over 20psi on them so far.
I know my reply was a bit of a sarcastic one... But seriously we're cramming air in these things and hoping to get it back out, so the smooth runners make little to no difference unless you are trying to make every last hp you can with your combo. If you are doing that, I wouldnt suggest using L92 heads anyway.
Bang for the buck, they are great heads though! Maybe when we start really shoving air in them we'll have issues with the "thin deck" but so far I can't say that its been a problem, and we've had over 20psi on them so far.
Bang for the buck, they are great heads though! Maybe when we start really shoving air in them we'll have issues with the "thin deck" but so far I can't say that its been a problem, and we've had over 20psi on them so far.
i've read some conflicting info so need clarification. do the assembled heads have additional work done to them versus the bare heads, e.g. decked, flashing cleaned better?
Nope, same heads are used on the assembled and bare versions.
Unless you opt for the GMPP CNC versions (or aftermarket) they will all be the same.
I'm with Frank in the fack that at 20psi it won't make a sh*t of difference how smooth the ports are.
There is some value in a quick clean up to the deck surface to ensure a good seal.
Unless you opt for the GMPP CNC versions (or aftermarket) they will all be the same.
I'm with Frank in the fack that at 20psi it won't make a sh*t of difference how smooth the ports are.
There is some value in a quick clean up to the deck surface to ensure a good seal.
i guess the l92/ls3 deck thickness "flaw" is just a myth.
many are chiming in with 700+rwhp on stock l92 heads
cool.
I told Rich to just take enough to make them flat and smooth, it wasn't very much at all. Maybe .001-.002?
Does the "thin deck" of th L92 head really make a big difference as far as reliability in a stock configuration? What is the most material that can be removed from these heads (from deck) before the integrity of the head is sacrificed? How can you distinguish the difference between the two versions of the heads as far as the smooth and rough castings are concerned?