The valvetrain in the 7.3L Powerstroke (1994-2003) consists of components that control the opening and closing of the engine’s intake and exhaust valves. It includes the camshaft, lifters, push rods, rocker arms, valves, and springs. The camshaft drives the entire system, with lifters transmitting its motion to the push rods, which in turn actuate the rocker arms to open and close the valves. This system ensures proper timing for air and exhaust flow, critical for efficient engine performance.