Oil pump hell.

How long did it sit? Was it broken in before it sat?

I run an HV pump in my 340. I get 75 psi cold at start up, at hot idle I get about 55 and that’s with 15-40w oil, if I run 20-50w it’s 60psi at hot idle. I don’t get any oil out of my exhaust at all. I was pulling a little oil through my PCV system before I baffled my valve covers and played around with a couple of PCV valves, but that was on the PCV side.

What I’m getting at is, you may have had a ring sealing issue, not an HV pump problem. Obviously the lack of oil pressure now is a separate issue.