long story short, clogged oil cooler and not bhg.
I have a tune, intake, exhaust and egr cooler delete.
Truck would puke coolant at high rpm and anything over 20 psi.
Truck ran great other than that.
I had several mechanics look at it and some said bhg, high egt's it becasue of the tune and others had no idea.
I have previouly had my radiator flushed moths before and remembered that it was 50% clogged.
I got to thinking and remebered that the 6.0 was bad about the cooler getting clogged. I opened the degas tank and drained it and there was sediment in the bottom.
I decided to pull my oil cooler thinking that if its fine, im halfway to the heads to see if its a bhg.
Pulled the cooler and ran water through it and the water would push back out more than flow through it.
Repalced the cooler and fixed the problem.