Spring/Keeper interference with Rocker

Have you tried cranking it with the cover off, I'v done this while recording to check lifter movement.

Oh yes, even ran it with the cover off, made a mess, but it told me nothing. Everything is cycling as it should. no 'de-primed' lifters, meaning I cannot push them in with the rocker when valves are closed. Considering the oiling at the lifters, I assume it is not a stuck lifter, as I would not get any oil to the rocker arm, correct?