This ATI Performance Products Super Damper Harmonic Balancer (part number 917780) is a must-have for anyone looking to improve their SBC's engine performance. It is designed to reduce harmful vibrations and improve the overall stability of your engine.

-Steel shell.

-Inner shell PN #916951.

-Internal balance.

-1.245" crankshaft.

-7.074" OD.

-No counterbore.

-Mounting hardware not included.

-Used, low mileage takeoff.