Allis Chalmers G2800, D2800, D2900, 301D, 301T Crankshaft Remachined 10/10 Rods & Mains 6 Cyl Diesel 4022491, 4020345, 4023823, 4022256, 4512316 Stroke: 4.25 Rod: 2.373 Main: 2.748 Flange: 4 threaded bolt holes, 2 dowel pin holes. Early model engines with cam driven oil pump and long (approx 2 1/8") front main journal length.