727 torque converter questions....

transman said

You need to remember that Chrysler supplied the 340 with a cast crank and the 383 with a steel crank.

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Actually, the Cast 340 Crank was only from Late 1972 - 1973. 1968 - 1972 340's used Forged Neutral Balance Crankshafts. Making the External Balance/Cast Crank 340 pretty much a "1 year" only deal.