head gasket problem 3 blown next copper

[e30man]

I installed a t3/t4 on my m20b25 with a 38mm "8psi" external wastegate and megasquirt computer. After blowing two stock gaskets we thought that it was just not enough clamping force from the stock bolts so I bought arp studs and a stainless gasket from vacmotorsports. The head was also milled true before installing the new gasket. During the first run with the new bolts and gaskets Joe(brother/mechanic/testdriver) found that the boost was getting up to 20psi(dont trust the map sensor from the megasquirt for actual values) using a gauge. the problem was solved to 14psi using higher quality wastegate pressure line and a 6000rpm boost cut. It was driven quite a bit like this while waiting for my new spec stage 3+ clutch to arrive so it could be dynoed. Soon after the clutch was installed it began overheating instantly when under boost. The head was removed and the stainless gasket was erroded through to a coolant passage. http://www.powerlabs.org/turbobimmer.htm

So the question is: Is a copper gasket better than layered stainless? and can someone tell me in detail what "O-Ringing" is and if its the answer to my problems?

[Highboosted]

o-ringing can be the answer.....buy your not going to like the cost. An MLS (multi-layered-steel) head gasket will do you good (copper is usually used as a "repair" gasket for uneven block surface). O-ringing is only nessessary when you plan on REALLY boosting the engine (35+ psi). O-ringing involves milling a grove in the block to fit a piece of wire around each cylinder bore. If you have a large enough CNC milling machine to fit your block in I say go for it. You need a better MAP sensor. A better fuel controller for that part, because your tune can have a major effect on how long parts like your head gasket last.