Was block pressure washed? I always replace cam bearings when I tear down and jet wash a BBM.
If cam journals are fine, I'd roll with it. Polish it up on the crank polisher, and go to town. S/F....Ken M
I hope it was washed many years ago ;-)
I have no idea why this happened and this low oil pressure idea seems to make sense.
It's not that I swapped cams yesterday or something.
Also camshaft really has zero marks on it. I will post a photo later this week. You can neither see or feel anything. Will have it checked for straightness just in case.