Problem solved!!!!!!!!!!!!
Executive summary - ordered new pump from Precision
oil pump with high pressure spring and installed (recommendation from poster on this thread). New data as follows with brad penn 20W50
oil at 100C. 60 psig at 2krpm, 63psig at 3krpm, 65psig at 4K rpm, 67psig from 4Krpm to 6k rpm!!!!!!! no pressure drop. Appears the original POS Mellon fuking
oil pump piece of sheet has an issue, probably sloppy clearances. In addition oil cooler, oil lines all plumbed and original OEM sizes!!!!! Oh by the way my gauge reads 3 psig low so add 3 psig to the above!!. Looks like I need lighter oil and back off the adjustment screw on the rv. The EPA has to love me with all the oil I spill, LOL!!! Reviewing my dyno sheet this engine had only 57 psig at 6Krpm on the stand where my last one had 68 psig. On the stand there is no oil cooler etc, that always seamed strange to me also leading me to believe the pump was weak or it had big bearing clearances.
Additional details. I called precision based on the recommendation on this thread. very knowlegdable, yet neither them nor Mellon would supply me a basic pump curve detailing flow vs rpm, how the fuk they stay in business. I told precision send me a new pump with high pressure spring. I had told him Mellon idiots had sent me a high pressure spring. He suggested to reuse mine and save $10.00 wtf. I said no way send new pump with high pressure spring installed and ship original spring loose. He did, what a miracle somebody doing what they are told. $180 later it arrives and I pull mine off. I decided to check his high pressure spring against Mellons. The first thing I notice is Mellons is 1/4" shorter!!!! I compare his spring length to his loose one in the box and my original I removed to install mellons high pressure spring and they are all the same length!!!!!!!!!!!! Fking Mellonidiots sent me a spring that I would have to bottom the rv adjustment just to get to what Precision spring is with the screw flush. I probably don't even need the high pressure spring. By the way cold at idle is 75 psig, LOL!! remember I have a 15 psig pressure drop across oil cooler. So the pump is discharging 90 psig at the pump outlet. RV Spring about 1/2 way in.
When I got the car it was 50 psig at 3Krpm dropping to 42 psig at 6k rpm. Kinda blows the theory about 10 psig per 1k rpm needed as this engine is perfect inside and I am confident it was that way for 5k miles!!!
I know a lot of profanity above but I deserve it on this one.
Randall Thomas from SCOF helped me tremendously on this one. He said leave no stone unturned and whatever you do to change it the culprit. It has burned in my head for months.
Got the sidepipes and headers back. Look great but we all know they dented one so now they get to fix it, when does it end????