Today I went with my Son to Thunderhill Raceway for an open track event. He. Has a nice '91 Mustang 5.0 coupe. Brembo brakes, body kit to allow 9" wheels and a lot of suspension work but still retains the stock 5.0 engine. After pounding it pretty hard and using a 6000 RPM redline, we ended the first and our only session and heard valvetrain noise and he said 0
oil pressure. There was no noise from rods or mains.
Oil is fresh Royal Purple. I'm thinking a plug popped out of one of the lifter galleys or the one at the top of the block near the rear OR the pump bypass stuck open. Stay tuned, news at 11:00.