Yes. For the purposes of compression testing, I just snug the adjusting screw to eliminate any clearance, then back off 1/4 turn of the screw to assure that the valves get completely closed. Be sure the distributor rotor is pointed at the cylinder you're adjusting to be sure both valves are supposed to be closed.
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
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