The McCormick 6637667A1 is a genuine OEM cylinder head gasket engineered for a precise fit and optimal engine sealing. This critical component is compatible with various McCormick C, CX, MC, and MTX series tractors, as well as Case IH JX, JXC, MXM, and MXU series. It also fits New Holland TL, TLA, TS, TSA, TM, T6000, and T7000 series agricultural machinery. Designed for Perkins 1004.4, 1004.40, 1004.4T, 1004.40T, 1004.40TA, 1006.6, 1006.60, 1006.60T, and 1006.60TA engines, ensuring reliable performance and preventing leaks.