Always a lot of talk so I have comprised a list of all the owners with L92 heads and a stock bottom end. I have also done my best to obtain cam specs and track times.
See the redone list below in post #7.
If I missed anyone please let me know as well as if I stated something incorrectly.
Also if any of you can fill in the places where there are ??? that would be great.
I'm not sure if its the ls2 tb or just the way the tps in the dbw cars are, as I have never used an ls3 tb with my setup. Every ls2 car i've seen only reads 88% at wot/fully open. To my knowledge the ls3 tb doesn't open any further or give more flow
Ugh I am still sitting on the edge trying to decide if I want to do this or not. I am very close to wimping out and just sticking with my stock stuff. Just seems stupid when I am going down to the lifter level already. Just no idea where to get milled and don;t want to end up having to fly cut. If no fly cutting was 1000% ensured it may be a different story. </rant>
Edit: Also no measuring pushrods, screwing that up, waiting for them to ship, etc.
Haha sadly no. Baby has been taking up all our time lately. AI porting my heads + cam from them was moving up the list as I would know exactly what I am getting and be able to order and install.
it's warming up here, I am so eager to start the build. how many of you had to air the cooling system out after the build? anyone had any overheating issues up on bolting it all up?
Me. But my t-stat decided to take a dump on me about 200 miles after. Regardless, you will have to keep checking the coolant levels as bubbles make their way out and top off accordingly. I would recommend driving it in the evening and as it cools off, take the cap off and leave it off over night. Top off in the morning accordingly.
Using lsl lobes for both intake and exhaust here. My thinking is the same as yours that a mid 220-low 230's duration cam works best with these heads and the weight of the Gto.
i have a set of ls3 heads, intake with fuelrails and 42 pound injectors. i am planning on link bar lifters and mill the heads 20. i need rockers and stands. what gasket thickness would anyone suggest? i would like 11 to 11.5 compression. i am also looking at a torque 2 cam. i am running a speed density tune so i don't need a maf. any thoughts or suggestions. tks
I order them direct from Cometic.
From cometic's site, you can hit Shop and it takes you to this SEP place that is their whole product line.
Took about 10 days to get last set I custom ordered...and pricing is as good as anyone online. I ordered 4.100 bore x .036 thick for a 418 stroker
I'm glad you posted this. I was going to put some thinner gaskets on this summer and switch to E85, and I was wondering, whats a safe, tight quench distance? I was leaning towards a set of .035 x 4.100. My compression will be at 11.7:1.
I put the .036 on with pistons that were flush to .002 below deck. If your pistons are proud you need to be careful.
I'd really want to know how much above they are at full rocked, and what they are at pin c/l and then order the gaskets.
My pistons are flush with the deck, and dished so my quench area is really compromised vs a flat top piston. It never even occurred to me when I built my motor.
nah your quench pad is still there on the piston, mirror of the flat part of the head. The dish is opposite the chamber side.
if your pistons are 0 deck and they don't rock more than say .018 or .020 then a .036 thickness should work ok. If you have some larger bore clearance or due to the skirt design it rocks more..then I'd leave a little more room
Does anyone know what the max is I can mill the L92 heads? I'm trying to get up to 12.5:1 compression this summer and switch to E85, and I'm using a combination of thinner .040 gaskets and milling.
I'm currently milled .040" at 64ccs, and I'd like to get them to 60ccs or lower.
You don't. If you have GM gaskets, just make sure that your mating surfaces are as clean as possible. Any other basket such as Cometics might call for copper head gasket sealant spray.
I can't launch worth a damn on the track, so my ET is pathetic. However, my best time at the track, at the beginning of April, was 12.6 @ 121mph. 2.2 sixty foot time
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
LS1GTO Forums
10.6M posts
64.6K members
Since 2003
LS1GTO.com is a forum community dedicated to the LS1 Pontiac GTO. Come discuss mods, horsepower, engine specs and more!