Mike,
If my cam was flat, I wouldn't be worrying about clattering valves.
Cap'n Krusty,
It seems I did not explain myself well enough. The rotor in my thread is to be used as a visual indication of where the camshaft angle is presently at with relation to the rotor position.
And, I think both exhaust or intake valves on cylinders that share the same cam lobe can be closed at the same time. Actually on any cylinder, as all that is necessary is for the lobe to be pointing vertical up or down. Then neither lifter will be in compression. I also think there is a position of the cam angle that will allow most if not all valves to be only partially open, versus fully open, which I believe would help to keep the hydraulic lifters from leaking down so far that it takes several minutes to pump back up. If that position is possible, then noting the rotor position would give one a visual reference to use to set the cam angle if the car is to be stored for a longer period.
If anyone has any experience in this, your thoughts are appreciated. I will take some extra time this spring when it warms up and when doing the valve adjustment, I will take some notes on where, if there is one, there might be a cam angle/rotor position that would help this condition and I will report back.
Tom