Head Gasket Fits Mitsubishi S6S EngineOne New Aftermarket Replacement Head Gasket Fits Mitsubishi S6S Engine Forklifts This cylinder head gasket seals the mating surface between the engine block and cylinder head on the Fits Mitsubishi S6S and S6SD diesel engine. A properly sealed head gasket maintains compression, prevents coolant and oil contamination of the combustion chamber, and is a critical component during engine overhaul or top end repair on S6S powered forklifts and industrial