How long did they last at that power level? I had one local dyno shop tuner tell me he didn't like these gaskets because they are corrosive, which was hard for me to believe.
Was his block O-ringed and what did he torque the head studs to, 100lbs or more?Over the course of two years.
He probably had the heads off 3 times doing different things not related to the gaskets. He always put another set back on and never had much trouble out of them.