Like jason said we are tryin to figure out what will hold. mine is 105 rings, the grooves are 30k deep, 24valve gasket and it seaps water and I am even runnin 2 water pressure reliefs set at 50psi. Just to recently find out that a opie kit opens at 25psi so I am gonna change them but I am wonderin what works for eveyone else. I daily drive,sled pull,dyno and play. I am runnin 800hp and runnin 80psi+ a lot. unlike jasons mine still get pretty hot egt wise yet jason is runnin 100psi+ and his lasted longer than mine guess the sled pullin did mine in. After studdin the 3 gaskets tonight and port matchin a 12v marine,24v and a mls cr. There is one in the front left corner of all three gaskets the cr is the only one that let's water threw all the rest it just blocks it off on the head. startin to wonder if I run a 12v or a 24v gasket should I weld a patch like a block off plate in the head so it won't put pressure on the gasket and cause a potential leak? And if anyone is runnin modifed thermostats (drilled) also let me know?