Setting valve lash with new, non filled hydraulic roller lifters

1/2 turn would be the max . If you are using your pumped up lifters that you soaked make them zero. turn the engine a couple times and go 1/4 do it again and go another 1/4. The reason for this is, You may be holding the valves open with 1/2 if the lifters don't squash down when going to start it. You should be able to turn the push rod when the lifter is on the base of the lobe.