This damper features the stock 3/16" keyway, plus it has a 1/4" keyway 180° from the stock keyway. This allows the damper to fit certain aftermarket dual keyway crankshafts. Although this engine is classed as an externally balanced engine, the counterweight is not part of the damper. It slides onto the crank before the damper is installed. The standard counterweight is Ford #M-6359- D460 and must be used unless the engine has been converted to an internal balanced assembly. The damper itself matches the original equipment damper dimensions. For additional information regarding this damper and these engines, download the Harmonic Damper Notes PDF file here.

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.