hi, don't set valves with motor running, it's damn near impossible to get a wrench to stay on rocker nut as it moves up and down,you can get your fingers pinched or broken, depends on how lucky you feel. the best and correct way is;, set motor on #1 tdc firing. lossen up adjusternut, back off rocker screw, till you have slack in pushrod. tighten down till no slack or play, then tighen rocker screw 1/4 turn to set preload. hold screw ,and tighten nut. turn motor 90 degrees to # 8, and repeat the same. by going through firing pattern, you will always have lifter on base circle of cam. also, will not get lost as to where you're at. the newer style lifters do not need or require 3/4 turn , you will have problems if you do.1/4 turn will equal .050 preload, which is plenty.all this is done with motor off.