The McCormick 3679865M1 is a genuine OEM cylinder head gasket designed for Perkins 1000 series engines, specifically models 1004-40, 1004-40T, 1004-42, 1004-4T, 1004-42T, 1006-6, and 1006-6T. This critical engine component ensures a proper seal between the cylinder head and engine block, preventing leaks and maintaining optimal engine compression. It is also an OEM equivalent for Massey Ferguson and Landini applications. With a thickness of 1.2 mm and 12 holes, this gasket provides reliable performance for various agricultural and industrial machinery.