CYLINDER BLOCK AND COVERS Serial No. 7M223 to 7M4324 Inclusive. 4F5893, 7B7754 and 1F9778 Block Assembly Parts are Shown on Pages 30A and 31. 4H7074 Piston and Liner Group, 2H5096 Cylinder Liner and Piston Replacement Gasket Group and 2H5086 or 2H5087 Valve Grinding Gasket Groups are Available. Piston and Liner Replacement Require the Use of 2H5096 and 2H5086 or 2H5087 Gasket Groups