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Alright, I see what you are saying. If the plunger in the lifter is up at the top pushing on the snap ring, would that still indicate too long of push rod? Thats what is confusing me, I can see if they were way down in the stroke of the plunger. But these are up against the snap ring. I thought that they lifter was supposed to run partially down in the plunger stroke. That way they could compensate for wear. Is this wrong?

I'm sorry I'm being difficult. I've worked on diesels my whole adult life, and they sure a heck don't have hydraulic lifters or carburators.

If the lifter is at the top of the travel against the snap ring the push rod is too short. You have to preload the hydraulic lifters somewhat. Some times the push rods are too long they push the plunger so far down in the bore that they bottom out the plunger then the person adds the 1 to 2 turns of preload and they are holding the valve open. This would be like preloading a solid lifter.