The McCormick 3686513M91 is an authentic OEM cylinder head gasket set designed for optimal sealing and performance in agricultural machinery. This essential engine component ensures a tight seal for the cylinder head, preventing leaks and maintaining proper engine compression. It is compatible with various McCormick X4 series tractors including X4.20, X4.30, X4.40, X4.50, X4.60, X4.70, and Massey Ferguson 4700, 5700, and 6700 series models. Weighing approximately 0.20 kg, this gasket set measures 330.2 mm in length, 279.4 mm in width, and 50.8 mm in height.