How do you adjust the rocker arms on a 289 ford engine?

To adjust the rocker arms on a 289 Ford engine, first, ensure the engine is at TDC (top dead center) on the compression stroke for the cylinder being adjusted. Loosen the rocker arm nut, then turn the adjusting screw until there is a slight resistance when moving the pushrod, typically about 1/4 to 1/2 turn more. Finally, re-tighten the rocker arm nut while holding the adjusting screw in place to maintain the setting. Repeat this process for each cylinder in the correct firing order.