Use the second portion of my last post regarding hydraulic flat tappet adjustment! Make sure the cam lobe is on its heel portion for the valve you are adjusting. Rotate the pushrod between your fingers as you tighten the adjusting nut, and just as you feel the rocker arm start to apply tension against the pushrod, tighten it an additional 1/8-1/4 turn,typically! Some people prefer them tighter, you might need to tweak several after you start the engine and break the cam in to quieten them down. But that will get you close.
