need some help with ls3 headgasket info
12-17-2007, 03:59 PM
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need some help with ls3 headgasket info i am building a forged ls3 and need to get the part number for the ls3/l92 head gasket and some specs for it so i can get my custom pistons on the way. here is what i need:
gasket bore diameter:
gasket volume in cc's:
angle cut...yes or no
if yes what the angle or degree
thanks
shane
gasket bore diameter:
gasket volume in cc's:
angle cut...yes or no
if yes what the angle or degree
thanks
shane
12-17-2007, 07:26 PM
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l92 are .051 compressed iirc......but i think that ls3 uses a different gasket. i would call your local gm parts dept and verify if i were you. that way you're sure and not taking some schmuck's advice on here that claims to know.
for a build using custom pistons i would definately pay the extra cash and get a set from cometic. measure your pistons to deck with a dial indicator and see how far below the deck surface they are stock. this can help you determinge a gasket thickness. .040 is ideal for quench. let your piston company know the measurement so they can take that into consideration and your gasket thickness when determining your quench. you may have to zero deck the block and use a .040 compressed mls gasket. but your piston company should be able to help you with this and tell you the best direction to go. remember the better the quench the less octane sensitive the motor will generally be. assuming your tune is right.
shoot me a pm with a price on your used ls3 pistons and rods.
for a build using custom pistons i would definately pay the extra cash and get a set from cometic. measure your pistons to deck with a dial indicator and see how far below the deck surface they are stock. this can help you determinge a gasket thickness. .040 is ideal for quench. let your piston company know the measurement so they can take that into consideration and your gasket thickness when determining your quench. you may have to zero deck the block and use a .040 compressed mls gasket. but your piston company should be able to help you with this and tell you the best direction to go. remember the better the quench the less octane sensitive the motor will generally be. assuming your tune is right.
shoot me a pm with a price on your used ls3 pistons and rods.
12-17-2007, 09:27 PM
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i have a ls2 in my vette and am building this motor from a block only up. then taking the ls2 and droping it in my 90 corvette race car 
lose couple hundred pounds and double the power!!! ne way so i want the pistons to be .o4o below the top of the block?
lose couple hundred pounds and double the power!!! ne way so i want the pistons to be .o4o below the top of the block?
12-18-2007, 05:11 AM
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no. ideally you want the top of the piston @ top dead center to be even with the deck surface. This is called zero deck height. Then you want to use a mls head gasket that has a compressed thickness of .040". This will give yo the ideal .040 quench youre looking for. call cometic and get your gasket options and the specs on them and then call youre piston company. they'll do the rest.
12-18-2007, 07:59 AM
#6
Its best to order your crank rods and pistons, assemble the short block, or at least the crank and one rod and piston combo, and then measure the piston height. THEN order your gaskets accordingly. I've had aftermarket pistons that were @ zero, and I've had em .005 out of the hole. Its best not to guess.
