I don't trust "spin". I've been able to spin a pushrod with a valve halfway down. I tighten until I can't feel any play.Opinions from those that have done the job. Adjust valve lash? I tighten till there is no play in the push rod. No slop back and forth and no spin. Then I do a full tightening turn on the rocker arm nut. Different methods?
Also, a full turn is too tight. I've always heard 1/4 to 1/2. Since I'm not trying to eliminate spin, which may make my lash a little loose, I go 1/2 a turn.