Hi Big Bopper --
You'll know if that's the case. A lifter is made up of the lifter body, spring, seal, cup and circlip (locks everything in the lifter body. If the spring inside of it broke and twisted, it will lock up the seal from being able to pump up and down to push oil up the push rod. It can also be solid in the bottom position with a broken spring.
Basically, it is the up and down that you are worried about with a locked lifter. You won't be able to push it down at all no matter what the position is. As a matter of fact, it is more than likely that the valve will be sitting open. Check with a straight edge if you can to see if it sitting low.
hemlock
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