Multicylinder internal combustion engine utilizing split block with unitized cylinder head and liner

In an internal combustion engine of the type having at least one cylinder and a crankshaft, an assembly comprised of first and second mating half sections joined in a common plane which passes through and along the axis of the crankshaft, each of said half sections providing crankcase, crankshaft bearing support, and cylinder water jacket portions, a unitized cylinder head and sleeve construction having a combustion chamber with a top surface therein and cooperative securing and sealing means for securing the unitized cylinder head and sleeve construction to the assembly in a location immediately adjacent the top surface of the combustion chamber, said cooperative securing and sealing means encircling each cylinder head and including tie bolts extending through the cylinder water jacket portions.