BlkBird2000

iTrader: (10)

I have a LQ4 with 317 heads and a ls6 intake that I will be boosting.

TC78 turbo 8-10 psi max
turbo cam
80lb injectors and dual fuel pump

Being as I am only going to go to 10psi max which should net me somewhere around 600hp, do I need to install ls9 head gaskets or will the factory gaskets work fine? LQ4 was installed before I bought the car. Far as I know the heads have never been off. I see guys that go upwards of 20 psi recommending the ls9 gaskets. Didn't think I would need them but wanted some input first before I ruled them out. Thanks.

Exidous

iTrader: (11)

Factory gaskets are fine. At 10psi get the thickness for the CR you want.

BlkBird2000

iTrader: (10)

I figure the compression for this motor was already pretty low. I rear also that head gaskets don't change the compression ratio.

samdogmx

iTrader: (14)

If its already together I wouldn't pull it apart to change them. The LS9 will lower your compression even more and since you only want to to 10psi I'd say your fine with factory.

crazyelf

iTrader: (21)

Ls9 gasket is the same compressed thickness as the other ls head gaskets and the bore size would only effect compression by a few hundredths. So I wouldnt sorry about that aspect.

Twin turbo c5

If its still together I'd run the factory one's. My 6.0 held the gaskets till I got to 22 psi with 179,000 miles on it . If not ls9 gasket it.

BlkBird2000

iTrader: (10)

I appreciate the feedback. I thought the stock gaskets would be fine. I have no intentions to make more power than I am with this setup. Hope this motor will last a few years. If it ever does blow up I'll buy a forged short block and go from there.