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ATI SBC Harmonic Damper SFI 6.325 Internal Balance 200400107 000 psi--stronger than OEM--and areProduct Description: Harmonic Balancer Super Damper 6. 325 in OD SFI 18. 1 Steel Black Oxide Internal Balance Small Block Chevy Sold Individually ATI Performance Products is a company founded on innovation, precision and service. ATI harmonic Super Dampers add horsepower and torque to race, street and truck engines. ATI Performance Products is the creation of over 40 years of Transmission and performance component manufacturing and racing experience.