Choose from the just added Blue, Orange or Turquoise Chrysler Harmonic balancer for the 383 and 440 RB engines. 1965-1971 Chrysler Harmonic Balancer for 383 and 440 RB Engines with Forged Steel Crankshaft. 7.25″ Internally Balanced for 1965-1971 383 and 440 CID RB engines with a forged steel crankshaft. To determine if you have a steel  [ Read More ]