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I would be concerned about bearings. Rod.main and cam. If you have pressure the oil pump must be working. When the engine heats up and the oil is thins it must no to registering because the bearing tolerance is too large. The only way to be sure is to drop the oil pan and inspect the main and rod bearings. The cam bearing inspection isn't quite as easy. If the crankshaft is scored the engine will have to be pulled and that is the time to check the cam bearings. When the head cracked you really don't know else happened. Just my opinion.