Crankshaft was changed 1962. Easy way to tell is check the size of flywheel nut. Without going out to look, I think the 1961 was 1-1/16″ hex, 1962 was 1-5/16″ hex. Kick me if that is not correct.
EDIT: Hold off on the kicks. On second thought, I think the small nut is 7/8″ hex and the larger one is 1-1/16″ hex. Still subject to verification, ’cause I don’t have one.
