I'm no expert but always thought the crankshafts were balanced by the holes drilled in the counterweights that were figured out by the engineers. Crankshafts were made to a specification and weight. All the holes were machined in a specific location, size and depth to meet the Pontiac desired bob weight. I know a lot of 103 cranks have the same size holes in them and in the same location. All the SD-455 cranks I've seen are in a different area of the counter weight and sized different compared to the 103's.
I'd like to know more as the factory assembly techniques always amazed me. I'm also curious why they needed the slight offset in the flywheel.
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