How do you adjust valves on 360 magnum engine?

To adjust the valves on a 360 Magnum engine, first ensure the engine is cold and disconnect the battery. Remove the valve covers and rotate the engine to top dead center (TDC) on the compression stroke of the cylinder you are adjusting. Use a feeler gauge to measure the clearance between the rocker arm and the valve stem, adjusting the rocker arm nut until the proper clearance is achieved, typically around 0.008 inches for intake and 0.010 inches for exhaust. Repeat this process for each cylinder, then reassemble and check your work before starting the engine.