I do what sparks does, loosen til they clatter, then tighten just til clatter stops, then another 1/2 turn (or less).
If you want to do it w engine off (good way to start off anyhow), set each cylinder at TDC compression stroke, make sure each lifter is right up against its snap ring ie at the top, with free lash. Tighten just til you still have about .002" lash ie some, not zero, then go another 1/2 turn and STOP. At first the pushrod wont turn, then after a minute or so it will turn - its supposed to - but youre DONE after 1 shot.
Sure, if the engine is new, never milled, etc, you can go down 1 turn or more - but that is why a lot of us use 1/2 turn - too many valve jobs, milling, gaskets, ground cams, etc - 1/2 turn is enough and it allows for stackups over the years/decades.
