I can’t imagine it having any oil pressure to speak of if a plug were missing.
And one would need to be really loose........ like ready to fall out before I think it would have that much affect on the pressure.
If you’re still employing the factory style through-the-cam top end oiling, I don’t see how the oiling to the top end could be the problem.
To me, that leaves a restricted or loose oil pump pick up, a restriction coming out of the pump into the block, a restriction in the pass side oil gallery........ or excessive bearing clearances somewhere.
Hopefully priming with the intake off will reveal something.
I just had a 360 on the dyno the other day.
It has edm lifters, pushrods with holes on both ends, and rockers than can be used as pushrod oiled.
It also retains the factory through-the-cam oiling(double oiling to the top)......... and plenty of side clearance between the rocker pairs.
Stock replacement type pan....... after several back to back pulls the oil pressure was still 30psi@1000 rpm.
About 65psi@6500 with Driven BR 15/50.
Thanks for your input that makes sense to me. I took the rocker assy's off and the passenger side rockers are black where they ride on the shaft the driver side is not. This seems odd because the driver side is down the line in the oil flow path. I'm going to pull the engine to check the pick up and engine bearings . I most likely will need to start over the build as the engine oil does not look good, it is black after only 15 min of running.... The lesson learned is ....if something doesn't seem right investigate till it does even if the machine shop tells you to" run it " . This is turning out to be a very expensive 440!
