Ok, so if the lifter plunger is against the snap ring, the push rod is tight, and the valve is slightly open, and the lifter is on the base of the cam, what do I look at next?

93 W250 CTD getrag, Bosch 185 injectors, AFE air filter. Trailer puller, daily driver,

90 W250 CTD 727 with smokin 5" stacks. Off road truck

75 Dodge W200 440 4spd 4x4 locked front and rear, twin disc clutch, E85. Pulling truck