Cummins 6C, 6CT, 6CTA, 8.3L, 505 OEM Crankshaft Remachined ST/ST Rods/Mains 6 Cyl Diesel SE390136, 3917320, 3917443 3918986, 390562, 3914584, 728533, 3918986, 3910968, 3914584, 3917443, 3904363, 3905625, 3917320 Left-hand helical, 42-tooth front gear. | Flange: Flat, 8 Bolt Holes, 1 Dowel Hole | Snout: Straight, 4 Bolt Holes, 1 Keyway | Stroke: 5.3150 in (135.001mm) | Rod Journal: 2.9916-2.9926 in (75.987-76.012mm) | Main Journal: 3.8568-3.8588 in (97.963-98.014mm) | 7 Mains | With Helical Gear