power valve makes my 440 ping??

thanks again guys, all helpful info.

the pump is electric I run no mech pump and the pressure starts at 5psi if left idle it creeps higher.

It has a factory 5/8 diam pcv, with 2 breathers in the opposite valve cover.

carbon build up was something I was thinking about, especially in the 1 or 2 cyl's with wide kwench distance.

after all my tuning today, I checked the oil for the first time sins the ping started.
It has never used oil in the past not a drop, now its down to add from half way between full n add.
so im thinking its my likely-est culprit, especially sins the chevy guy that machined my engine wouldn't mill the intake face on the heads, he sed its too hard to do and its not needed, that it would all go together no problem.
anyway thank you all for your imput, its very well apresiated and ill let you no how I go, thanks Tim