11SECSS

iTrader: (199)

Okay my motor is a stock LS1 long block with 77k on it took the heads off to have a valve job and new comp 918 springs also adding a LS6 cam .Was wondering which head gaskets to use GM MLS 12498544 or the LS9 12622033 which has a 4.1 bore ? The stock gaskets seemed to work just fine before taking off the heads. Motor is making around 8 psi but might take it up to 10 with a smaller pulley and the aster bracket I picked up (hopefully no more belt slip).

Twin turbo c5

ls9 I've used them for years at 20psi or more . Defintly the way to go.

samdogmx

iTrader: (14)

since its a small bore motor & your talking low boost I'd stick with the stock gasket. The bigger bore of the ls9 will drop your compression a wee bit & IMO is not needed at only 10psi

ls1curt

iTrader: (31)

Just stick with the stock gasket. It will be fine.

11SECSS

iTrader: (199)

thanks a lot guys ,I'm going with the stock GM MLS ones .