This is the Cylinder Head with Valves for the O.S. Max FS-91-P (Pump) and FS-91 Surpass II Four Stroke Engine. The cylinder head bolts to the top of the crankcase and houses the intake and exhaust valve assembly and the glow plug. FEATURES: Replaces damaged intake manifolds. Intake and exhaust valve assemblies are pre-installed. Constructed of aluminum with brass alloy valve seats. INCLUDES: One Cylinder Head with Valves for the O.S. Max FS-91-P and FS 91 Surpass II One cylinder head gasket. REQUIRES: Installing rocker cover, intake manifold and glow plug. Bolting to crankcase with O.S. screw set, (OSMG8814). COMMENTS: For cylinder head without valve assemblies, use OSMG5136. dew 1/31/02 ir/kh