The McCormick 3427774M2 is a genuine OEM piston designed for specific McCormick MC series agricultural tractors. This high-quality engine component is crucial for maintaining proper engine compression and power output. With a bore diameter of 91.44 mm and a piston pin diameter of 35 mm, it is engineered for durability and precise fitment, ensuring reliable performance and longevity for your McCormick machinery. Ideal for engine overhaul or repair, this piston meets original manufacturer specifications.