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I've seen a lot of superficial/benign cracks in 6.0 powerstroke heads, I've done a lot of them. Every now and then you have a complete failure though. Long story short, I'm no stranger to engine work. I may see if I can get a machine shop to grind some reliefs. That cat has a relief there...

My engine "ran away" because I accidentally installed the shutoff lever 180 out and it increased fuel instead of cutting it. My heads are junk, but I have heads off my parts engine that I am rebuilding, the parts heads have a completely flat surface and my old heads are ground about 3/16"...