A noisy hydraulic lifter is a symptom of another problem, usually. Stovebolt hydraulic lifters are notorious for getting an internal air lock that prevents proper adjustment unless a relief groove is ground into the ball end of the pushrod where it intersects the lifter plunger. This situation is caused by the lack of oil flow up the pushrod like on the V8's and later inline sixes. The stovebolt pushrods are solid. There's a tech tip somewhere on how to make the lifter leak a little oil out the top to eliminate the air lock by grinding a shallow groove in the pushrod ball area.
Jerry
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