I am assuming a hydraulic cam? But you adjust them just like any other rocker. 1/2 turn preload is safe. With polylocks it is easier to do with the engine off. I pick the rocker to adjust and move the pushrod up and down until all the slack is out of it. Then put a dot on the poly lock at 12 oclock. Tighten poly lock to about 5 oclock position. Tighten set screw, and then try to tighten poly lock almost to 6 oclock position. Now it has almost 1/2 turn preload and set screw is jammed.