We never recommend turning the adjuster more than 2-1/2 turns down. Pushrod length is determined by the following: (1) Turn the adjuster all the way up into the recess in the rocker body until it stops. (2) Turn the adjuster down one full rotation. (3) This is the initial adjuster position. (4) Once the engine is fully assembled, this will be the starting position where lash will be set, and the adjuster should NEVER be turned one full turn either up or down. For general information, the hole in the adjuster that feeds oil to the pushrod cup shuts off flow completely when the adjuster goes just past two turns down from the initial adjuster position.