I have been trying to bring a 93 Montero SR back to life. Had the engine parts machined at a reputable shop a couple years ago. Blew a head gasket soon after the rebuild. Fixed that one and later it happened again. So, I have blown a head gasket twice.

During the last head gasket replacement I was careful to assure that the head bolts were NOT bottoming out before the torquing.

The heads were milled a bit by the machine shop. So, now my thinkig is that the compression is slightly higher than stock, and the stock head gaskets are not holding up.

I'm considering installing ARP studs (allbeit an expensive alternative to standard head bolts).

If anyone has other ideas about what is happening to cause this 6g72 SOHC engine to blow gaskets, I'm all ears!

Thanks for reading