Insulated exhaust port liner

摘要

An exhaust port liner assembly for use in a cylinder head of a vehicle engine composed of spaced inner and outer tubular metal shells having a mass of heat insulating material within the spaced shells and a gasket within the said spaced shells adjacent the outlet port. A metal cylinder head is cast around the spaced inner and outer shells while a removable insert is positioned within the spaced shells adjacent the outlet port. After casting of the metal cylinder head, the insert is removed and replaced by a gasket member.