The following pictures are of a Felpro installed about 800 miles ago. I installed it with ARP pro bolts and torqued to 80 ft/lbs. with ARP moly lube. Obviously, Felpro stock type gaskets just don't hold up. It should be noted that there were absolutely none of the usual signs of detonation.
Notice the bulges. The gasket pinched up into the head.
You can see that the problems was starting here as well.
On the block, there is only one coolant hole and the gasket has two, with the section between them going directly over the one hole in the block. The head has two with a passage right in the middle.
Head surface before lapping.
Head surface after mild lapping.
Block deck after lapping.
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