Genuine OEM Ford Valve Rocker Arm Shaft Bolt, part number 1135379. This bolt is specifically designed to secure the rocker arm shaft within the engine's valvetrain assembly. Proper installation and torque are critical for the correct operation of the valves and overall engine performance. Manufactured from high-strength steel to withstand the stresses of engine operation. Genuine Ford bolts ensure the correct thread pitch, material strength, and head design for a secure and reliable fit.