which cometic head gasket and why?
#1
which cometic head gasket and why?
I'm getting ready to order head gaskets and I'm trying to figure out which cometics to use with my set up. There seem to be many options cometic offers for an LS1. Which gasket would yield the best performance gains?
This is what i have:
stock bottom ls1
comp 228/230 .571/.573 112lsa (intake 71* abdc)
ported unmilled 799 heads with stock valves
cometic gaskets:
part# / compressed thickness
C5475-040 (.040")
C5475-036 (.036")
C5475-030 (.030")
C5475-027 (.027")
This is what i have:
stock bottom ls1
comp 228/230 .571/.573 112lsa (intake 71* abdc)
ported unmilled 799 heads with stock valves
cometic gaskets:
part# / compressed thickness
C5475-040 (.040")
C5475-036 (.036")
C5475-030 (.030")
C5475-027 (.027")
Last edited by poltergeist 02; 04-04-2012 at 07:12 AM.
#4
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I would not go thinner than .040" due to reduced quench clearances and due to the thinner you go the harder they are to seal. Personally, I like the GM MLS gaskets.
Last edited by batboy; 04-04-2012 at 08:42 PM.
#7
With stock pistons id use the .040" gaskets, i'm using a .027" cometics gaskets but iv also got -8cc dish pistons, if had a smaller dish piston would've used a .040" myself.
Last edited by ausls1; 04-05-2012 at 08:06 AM.
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#9
I'd also use the .040". On average your piston sits around .005" up out of the hole so that would give you a .035 quench..035-.030 is optimum, when you get tighter there are gains, but as the metal stretches and expands it leaves less room for error.