Allis Chalmers G2800, D2800, D2900, 301 OEM Crankshaft Remachined 10/20 Rods & Mains 6 Cyl Diesel 4022491, 4020345, 4023823, 4022256 Fits early model engines with cam driven oil pump and long (approx. 2 1/8?) front main journal length. Flywheel flange has 4 bolt holes and 2 dowel pin holes. * Stroke: 4.250" * Rod Journal: 2.3720-2.3735" * Main Journal: 2.7465-2.7480" * 7 Mains * With Helical Gear With Helical Gear