The McCormick 6679377A1 is a genuine OEM rocker arm designed for specific McCormick agricultural machinery. This critical engine component plays a vital role in the valve train, transmitting the camshaft's motion to open and close the engine valves. Manufactured to original equipment specifications, it ensures optimal engine performance, precise valve timing, and long-lasting reliability. This rocker arm is an essential replacement part for maintaining the integrity and efficiency of your McCormick engine.