Im having the same issue. I have a 350 bore 60 over .510 lift cam vic jr +1 intake holly 750 double pump nothing special with maybe 35 miles on it and since day one when i did my cam brake in its had bout 30psi on cold start up, 50psi at cruising speed, and once warmed up at idle my guage will hit 0 but still oil coming out my pushrods/rockers. Ive got 2500 invested in just the short block parts and labor to put it together and im not trying to have it go to **** and the guy who built it dont have an idea why its doing that wich has me worried even more. I dont believe the high volume pump will work cuz i was told it was a high volume low pressure pump. Im no engine builder i can tune but cant build so a lil more help on those plugs some guys have mentioned would help me out alot. Thanks for everyones time.