Supercharger Harmonic Balancer/Damper, Small Block Chevy Early, 6 3/4 in., Internal Balance, Drilled for Factory 3-Bolt Pulley & 6-Bolt Gilmer Supercharger Drive Pulley, Dual Keyways: 1/4 in. & 3/16 in., SFI 18.1 Approved, Steel Hub|JEGS Supercharger Harmonic Balancer/Damper Small Block Chevy Early, 6-3/4".
