Allis Chalmers 301, 2800/2900 OEM Crankshaft Remachined ST/10 Rods/Mains 6 Cyl Diesel, Gas 4023823, 4008146, 4008147, 400988, 4022256, 4009885 Fits late model engines with crank driven oil pump and short (approx. 1 3/4 in) front main journal length. Flywheel flange has 6 threaded bolt holes. | Flange: 6 Bolt | Stroke: 4.250 in | Rod Journal: 2.373 in | Main Journal: 2.748 in | 7 Mains | With Helical Gear