Here's a quick and dirty history of this 304 that has no oil coming out of the push rods. Given to me by a friend and said that it sat in a field for 10+ years but it ran great. Got it home and pulled it apart and put new gaskets in it and inspected as well as cleaned it. I ran the motor for a few months and it seemed great. Then it started running rough. Did a compression check and it came out great. Found first two cam lobes in front of engine were worn off. I replaced the cam, lifters, rebuilt the oil pump, and put in new crank bearings. Just trying to bump up oil pressure. Engine runs great again.
Ran it for a few months and it started running rough and it sounds like an egg beater. I have 40 to 60Lbs of oil pressure at all times. Did another compression check and all cylinders good. Pop off valve covers and the upper valvetrain is bone dry. Start up motor and notice that no oil is shooting out of the push rods.
I have oil pressure. Crank must be getting oil or the engine would have seized by now. I suspect a blockage somewhere that is preventing oil from getting to the lifters. Any ideas where to look to find the blockage?