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Where can I find a good quality head gasket and head studs for my b230 +T car going to be running around 13 psi out of a 19T, want it to be reliable. Are there any thicker gaskets to lower the compression a bit?
Using a thicker gasket to drop compression ratio is one of the worst things you can do on an 8v. The quench pads are important, and a thicker gasket makes theme useless. Often times a thinner gasket is better (to a point).
Best way to drop CR on a 8v is to open up the exhaust side of the combustion chamber.
As far as a good gasket: Elring gasket kits are not coming with a RTV/Silicone bead around the water and oil ports. These are great gaskets, and work well into very high HP and boost ranges.
https://www.fcpeuro.com/products/volvo-engine-cylinder-head-gasket-940-740-760-780-244-245-240-242
Looks rather a lot like a silicone bead around the water and oil ports on that picture.