Do you just tighten down the rocker arm?

Tightening down the rocker arm is part of the adjustment process, but it’s essential to ensure that it's set to the correct specifications for your engine. Proper adjustment typically involves setting the clearance or lash between the rocker arm and the pushrod, which can vary depending on the engine design. Simply tightening it without proper adjustment can lead to poor engine performance or damage. Always refer to the manufacturer's guidelines for the correct procedure.