Regarding oil, the engine has excellent oil pressure... 80 PSI on cold startup, 50-60 going down the road and 25 at 800 rpm idle after fully warmed up. When i took the valve cover off, there was oil laying in the valleys of each of the rockers. So, oiling looks good to me. Because of good pressure, i am very hesitant to run the engine with covers off to try and detect which lefter(s) are creating the problem.
Cold, i could not detect any clearance in any of the valves when closed.
Last issue is that they do get Noisier when fully warmed up than they are cold. Does this point to a lifter itself??