The simple way to identify a hydraulic lifter involves doing nothing more than removing the valve cover. Turn the engine clockwise from the front until the #6 exhaust valve spring is fully compressed (last one closest to the firewall). Continue rotating the engine until the exhaust spring relaxes and the #6 intake rocker arm (Next one in line) just begins to move.Go to either one of the #1 cylinder rocker arms and put a firm downward pressure on the side of the rocker with the adjusting screw in it with a long screwdriver or a pry bar under the rocker arm pivot shaft. If a hydraulic lifter is involved the gap betweem the rocker arm and the valve stem will open up to 1/8" or more within a couple of minutes of holding pressure against the lifter. The lifter will pump back up as soon as the engine is started. No rocker arm movement after a couple of minutes indicates you've got solid lifters.
Jerry

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