[P.S.]

The all original 29 Fordor was running super sweet. On the way home from the club breakfast last weekend, it suddenly developed a vibration that got worse very quickly (it normally is as smooth as a 2015 Ford). I shut it down and pulled over. Came home on the metallic magic carpet. Pulled the motor today. See attached.

Center main babbit is completely gone from the cap. Everything else looks perfect inside. No damage to crank, miraculously. Other mains look perfect.

Not sure what caused this in a factory stock motor. It was sure sudden.

The oil looks dirtier in the photo than it actually is.