Replaced that engine this year when hole in oil pan left the driver with 5lbs of pressure suddenly. I have not taken that bottom end apart yet, but it was still running.
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Better take it apart and check it. Did the same thing on a fresh engine when the oil drain plug got left loose before a test day. Halfway through the first lap, it came out. I kept oil pressure almost the entire rest of the lap. Put in a new plug and fresh oil, ran the rest of the test day with good pressure, but not great pressure. Got home, checked things out, had two rods and two mains scarred. No damage to crank, but that was almost an expensive lesson.

Did I tell you the owners of the track and the other guys testing that day weren't very pleased with me oiling down there track and shutting down business for a couple of hours?