Noise sounds like rocker arm clatter, oil pressure stays strong and if you hold it in that range for any length of time the noise stays the same. The oil looks clean as does the oil laying in the heads when the covers are off. I have tried different oils 20-50 originally and recently changed to 10-30 to see if that would change the noise, which it didn't. Oil pressure is high and this motor has no more then 500 miles on it since a complete rebuild, may go to a hydraulic roller if I can't figure this out, hate the thought of that expense this winter but would like to try and keep this cam if I can get it quieted down since it works so well, thing sounds like a diesel in that bad range.