Setting valve lash with new, non filled hydraulic roller lifters

Light handed is the key when taking lash out. You do not want to depress the plunger at all before you set the preload. I never fill (pump up) hydraulic lifters before installing them. But I always pre oil the engines before starting them the first time to fill the lifters. 3/4 to 1 turn of preload should be fine on stock hydraulic rollers.