I've had two blow out, one thick and one thin.. Both in the same spot and both with the exact same boost.. The first time I thought it was because of too much porting to the head compromised the head bolt area, fixed that and ran for a year with much thinner gaskets almost one year later it happened it the exact same spot on the same head and it was the first time in a year I ran 47 lbs of boost again.. The second time the head was junk..

 

Ouch. That sucks.

My setup is not so......extreme. Likely never see more than 1/3 of that boost.

 

Copper and o-rings?

 

Likely Cometic MLS.

 

.04 -.043

 

I run .080 with no problems when you go lean it dont matter how thick of gasket you have

 

Not really seen it make a difference but I personally haven't run any gaskets on boost thicker than .050". If running copper/o-ringed it's not a good idea to run more than 30℅ of the gasket thickness on ring protrusion. I generally stay between 25-30℅. Too much protrusion can act like a die punch and try to shear the gasket.

 

^^^^ this I forgot about the guys running copper with receiver groves . I run o-rings in both my heads and block that's why the thick gasket . Carry on