Low oil pressure?

Cope said
My new engine is having an oil pressure issue.

At idle I make 25psi hot, 50PSI at 1000 rpm and 65+ above 2000 rpm.

I've been doing some freeway testing and after 15 min at around 2,500-2,000 RPM I got off the free way and oil pressure dropped to almost zero. We're not talking hard on the breaks or down hill just sitting at the light. I put my foot in it to bump it up back to 25 so it was not idling at zero. Twice now I've seen it do this.

HV pump running 20-50 Joe Gibbs oil.
Factory car pan.

Maybe 200 miles on a full build.
Balance, blueprint the whole nine yards.

I'm on my second oil change, I drained it at about 100 miles and cut the filter just to make sure all was well. No metal in the filter.

11.5-1 comp ratio.
Big lumpy cam (dont have the specs on hand)

Any ideas, I'd hate to pull the engine again but I also dont want to ruin my new engine...

Engine was built at a very good, high performance machine shop.

I see a few things here. 25 psi hot @ probably 600-800 rpm is pretty low given all the rest. When running on the freeway in the summer especially, the oil gets pretty hot and viscosity drops of course. I bet your lifter bores are on the worn side, and other bearing clearances are on the loose side-combine this with 20w/50 being pumped by an HV pump and sustained rpm all you are seeing is HOT oil and idle speed pressures. You can try more oil but that won't likely solve your issue. Also a pickup that is too far off the bottom would show momentary low oil pressure but recover within a few seconds-same with a cracked p-u tube.

I believe the root cause is oil leaking internally , too much. J.Rob