I don't know but probably the oil got too hot. One radiator fan wasn't working, and I did two back to back hot passes at the drag strip with a heat soaked engine. Had to wait in line for my turn while the engine was running and the oil pressure dropped right after the second pass. Since the oil pressure drop was at the drag strip, the beating issue probably happened there. However, I did drive the car home after a couple hours of cooling down and then occassionally drove it for another 2 weeks. Several times taking it up to redline. But I have little doubdt that the bearing damage happed at the drag strip.
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