Wisconsin crankshaft W4-1770. This is from a W4-1770 engine that broke a ring land. It has been to the machine shop and has been verified round and in standard spec. It is ready to bolt in with new standard bearings. The output shaft measures 2" from the edge of the inner bearing race and is 1 7/16" in diameter. The keyways are in excellent shape. As you can see, it is in near perfect condition. Thanks for looking and feel free to ask any questions.