Oepn chamber head
03-17-2006, 09:36 AM
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Open chamber head Is there such thing as an open chamber ls2 or ls1 head? Reason being, I was trying to figure out a way to lower the compression of a new '05 GTO (without changing pistons), so I could run more boost on the stock internals. I know a thicker head gasket can lower it but I think that is only by 1/2 a point or so. Any help would be greatly appreciated... The car only has about 42 miles on it so after the break in period I was thinking of either adding a D1SC or a STS turbo kit, and another thing why doesn’t anyone run the Paxton SC???
Last edited by DaGreightOne; 03-17-2006 at 02:28 PM.
03-17-2006, 11:40 PM
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If you are considering boost for the LS2 you could go with a set of port'd 72 cc LQ9 heads (LS2 are 62 or 64cc). That should help get the compression down.
Maybe look into working a deal with one of the vendor's that offer ported LQ9's to get a cor charge for the LS2 heads you currently have.
Now with the taller LQ9's you'll probably need a different set of push rods.
Maybe look into working a deal with one of the vendor's that offer ported LQ9's to get a cor charge for the LS2 heads you currently have.
Now with the taller LQ9's you'll probably need a different set of push rods.
03-18-2006, 06:13 PM
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patriot can do any chamber size you want, from 59cc to 72cc in their LS6 style heads (ported LQ9s), and you could also go with a thicker gasket to help decrease it some more.
03-18-2006, 06:49 PM
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Originally Posted by DaGreightOne
Is there such thing as an open chamber ls2 or ls1 head? Reason being, I was trying to figure out a way to lower the compression of a new '05 GTO (without changing pistons), so I could run more boost on the stock internals. I know a thicker head gasket can lower it but I think that is only by 1/2 a point or so. Any help would be greatly appreciated... The car only has about 42 miles on it so after the break in period I was thinking of either adding a D1SC or a STS turbo kit, and another thing why doesn’t anyone run the Paxton SC???
Ed
03-18-2006, 09:20 PM
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Well how much boost do you think a LS2 stock bottom end will take or how much power do you think it will take??? And still be dependable...
03-26-2006, 01:54 PM
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Some .060 headgaskets and some 72cc heads would get you in the 10:1 range. You could probably run 10psi on that and make good power and be reliable for a good while. I buddy of mine is running 9psi D1SC on a stock longblock 04 LS1 GTO and put down 500rwhp. Car drives like stock. 05 LS2 w/10psi and 10:1cr should be ok and put down around 550rwhp...just my 2 cents...
