The McCormick 3552222M91 is a genuine OEM cylinder head gasket set designed for Perkins 1004 series engines, including 1004.40T, 1004.40TA, 1004.42, and 1004.4T. This comprehensive gasket set ensures a proper seal for the cylinder head, crucial for engine performance and preventing leaks. It is compatible with various McCormick CX, MC, and MTX series agricultural tractors, providing reliable sealing for critical engine components.