How do you adjust valves to 0 lash?

To adjust valves to 0 lash, first ensure the engine is off and cool. Rotate the engine to align the rocker arm with the valve stem at its lowest point (the point where the valve is fully closed). Next, loosen the adjusting nut on the rocker arm until the pushrod can be turned with slight resistance, then tighten the nut until there's no more play, followed by an additional quarter turn to achieve 0 lash. Repeat this process for each valve, ensuring you follow the correct firing order for multiple cylinders.