Professional Products PowerForce harmonic dampers are extremely durable—and economically priced. They're built with a bonding process which adheres the elastomer to the I.D. of the inertia ring and the O.D. of the hub, utilizing a strong adhesive along with an improved elastomer to create a much stronger bond. PowerForce dampers also feature white, easy-to-read timing marks against a painted black background. Each unit is accurately balanced and closely machined for the correct fit. Dozens of models are available for applications from 1955 and up. Choose the size, material, finish, keyways, and other options recommended for your vehicle.

7.5 in. 352/390/406/410/427/428 Big Block FE Ford Harmonic Damper. This damper is identical dimensionally to the damper originally used on the high performance 427. That engine's stock damper had an integral single groove pulley. Our damper includes this pulley and although our damper is 7.5 in diameter, it can be used on any FE engine including those that had a stock 7 damper. This damper is designed to allow the removal of the stock single groove pulley, and your multiple groove pulleys can bolt directly to it. An adapter spacer is included with the damper to allow proper belt alignment. This damper also comes with a universal timing pointer to suit the larger 7.5 diameter damper and the pointer will bolt to either of the two different bolt patterns Ford used for timing pointers.