Cummins 3634664 Head Gasket is a replacement cylinder-head gasket for Cummins diesel engines, specifically the KTA19 and QSK19 families, including the 38 and 50 variants. This USGI part, identified by the 3634664 designation, seals the interface between the cylinder head and the engine block to separate the combustion chamber from coolant and oil passages, helping maintain compression across cylinders. It is a direct-fit gasket used in top-end repairs or engine maintenance for these engine families.
