Genuine OEM Ford Valve Rocker Arm, part number 1145958. This critical engine component transfers the rotational motion from the camshaft lobes to the valves, opening and closing them to control the flow of air and exhaust gases. It is typically manufactured from hardened steel to withstand the high stresses and temperatures within the engine. Proper functioning of the rocker arm is essential for efficient combustion and overall engine performance. Genuine OEM parts ensure precise geometry and material strength for reliable operation.