If its a 440 crank, one way to tell them apart is to examine the crank for a raised up cast "440" on one of the counterweights, not stamped in but raised. If you find that, it is cast. The other way is to look at the seperating lines but that is difficult to explain here (better in a photo). Of course, if you have the original balancer, it will be thick and have "440 cast only" or something like that on it.