It just looked really odd that ONE adjustment screw was very noticeably "taller" than all the rest of the rocker arms.
You did not say screw in your initial description. If that adjusting screw is sticking out farther than the others did you check your lash? Sounds like the screw loosened not the lifter pumped up. how does it lock the adjusters?
Since you already pulled the valve train apart just eyeball the lifter and see if the snap ring is there but that doesn't sound like the problem.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
