One more.
I've found that the head is severely warped. The head gasket doesn't seem totally blown, although the water jacket and oil passages are clearly compromised, right where the head is warped. It would have blown eventually. I don't think the shop that replaced the head gasket for the previous owner back in April machined the head like they claim.
I've also found a big difference in clearance between the valves and the cams. The #4 intake valves have a clearance, when closed, of only .003" or so. The other valves are all closer to .010".
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