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From: Hank Dozier
Remote Name: 184.108.40.206
Date: January 31, 2003
The early poly "A" cranks were all steel. Some a little better than others (rolled-fillet journals and/or heat-tretment). The "LA" engines came both ways. Early LA's were steel, and then around 1970 Chrysler switched to cast cranks for cost reductions. I also believe that the cast units may be externally balanced, so that would require a different harmonic balancer and flywheel/converter flex plate than steel cranks, which were all internally balanced. I would query your shop man again about which years of cranks he is speaking of, to clarify things.