Add to Favorite Sellers. Engine Overhaul Kit Fits Farmall M MV O6 OS6 T6 W6 Tractors 374264R91 369958R91. Quality Aftermarket Engine Overhaul Kit Fits International Harvester IH Farmall all gas: M, I6, O6, T6, W6 Tractors Specifications 4″ overbore, 1.312″ wrist pin O. Includes sleeves, stepped head aluminum pistons, piston ring sets, piston pins & pin retainers. Includes all gaskets and crankshaft seals for your major engine overhaul. Governor seal not included. Replacement Numbers 355013R91, 369957R1, 369957R2, 369958R91, 37464R91, 46173DC, 46173DD, 46181DB, 46181DC, 55621D, 55621DA, 55621DC, PK155. Don’t forget to leave us feedback and we will be sure to do the same! . Thank you for this opportunity to earn your business! Thank you for looking! We appreciate the opportunity to earn your business. Feel free to ask any questions you may have.