Originally Posted by TMCRacing
Copper coat is for paper and metal gaskets only. This material should not be used on a stock head gasket.
This is funny
. Copper spray has been controvercial for use on metal, not composite.
I've popped so many OEM composite headgaskets. . . On various cars. Notibly the 4G63. I've sprayed all replacement gaskets w/ copper spray. And none have failed since. I'm not advocating the use of copper spray for higher durability. But it will not negate the potential strenth of an OEM material gasket.
I've run 30 psi w/ an 18G and FP2Xs, high timing and a lean tune (very, very high cylinder pressures) on the oem copper sprayed HG w/ nothing but arp headstuds.
Conversly. All of my felpro gaskets have failed even when ARP studs have been used. My old '85 T-bird TC could not keep a gasket over 20 psi no matter what I tried. . . until I went back to OEM.