With the valves closed on any cylinder, use a long screwdriver or a pry bar to put firm pressure against the pushrod end of a rocker arm for 2-3 minutes. A solid lifter will not allow the gap to change between the rocker arm and the valve stem. A hydraulic lifter will bleed down and end up with a gap close to 1/8" between the rocker and the valve stem.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!