I have a stethoscope. that's what I used to isolate the problem to #6. The noise is loudest when touching the stethoscope to the rockers for #6. Not as loud for #5, almost non-existent for #4-#1.
John, I'm adjusting the valves by loosening until I can feel a perceptible click while idling, tightening till the click just goes away, then 1 more turn. But note, when I took the pushrods for #6 out of the engine, I still got the noise at ~1500-2000 rpm. The valves weren't even being used. So, it can't be related to valve adjustment for #6, right?
regards,
Leon
