Pulled the passenger side valve cover. Looks like normal rocker arm action. Did notice that some of the pushrods are really rotating quickly, some not so quick, and #6 exhaust is not rotating at all. You can see a video at my Youtube channel at:
https://www.youtube.com/channel/UCXxvWDoVWUSusn7JVgi1Fkw I pulled off the rocker arm assembly and checked this pushrod. Ends looked nice and round/smooth and rolled it on flat surface and no evidence of being bent. Rocker arm cup itself looks good and the same as the others.
Put a dab of assembly lube on tips of rocker arms, reinstalled with no change. From idle to ~3000rpm that pushrod does not rotate. Trying to convince myself not to pull the intake manifold and lifter valley cover to see if the lifter itself is not rotating. But seems like the only logical next step.
Any thoughts of what to do or look for next would be appreciated. I feel that I have a vacuum leak but can not find it.
thx
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