Originally Posted by wed68
I started a rebuilt 350 a few days ago, broke it in proper, it had great oil pressure the entire break in and the first few test drives. Today I took it out for a little 20 minute drive at about 55mph and it seemed to gradually lose oil pressure eventually getting hot and losing power. I got it home ok but now it has no oil pressure at idle but the pressure will come up as the engine revs.
Any ideas on where to start looking? It never knocked or ticked like a rod bearing spun! It starts fine just has no pressure at idle.
Did you change the oil and filter after the break-in period? Avoid Fram filters (IMO), use an AC or Wix (Napa or Carquest). Ed