Crankshaft Remachined Allis Chalmers 301 40/20 Rods & Mains 6 Cyl Diesel 4022491, 4020345, 4023823, 4022256, 4512316 G2800, D2800, D2900 Stroke: 4.25" Rod: 2.3725-2.3735" Main: 2.7465-2.7480" 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. OEM