Don, its not as long and drawn out as it sounds if you have a well equipt shop. We had a Bridgeport mill and a V-block fixture to place the crank in to begin removing material from the rod cheek area first. Then we could also use the same fixture to knife-edge the counter weights. Once that was done, the crank was put in a big lathe or our crankgrinder to start removing the counterweights to offset the mass that was taken off by knife-edging and material removed from the crank cheek area. Once you got it close enough balance-wise, where you could spin it on the balance machine, you either took the rest of the material off in the lathe, or was just finished with a hand grinder. Also, all the remaining factory drilled balance holes in the counter weights were also welded up to reduce windage, so you had a smooth counterweight OD, with no holes in it. So, all in all it took about 2 full days to lighten and balance the crank. Then the rod and main journals were reground and it was sent out to be nitrided.
