4 bolt standard Ford pulley bolt pattern. Crank key modifications may be required on some 429 Boss engines-may need a stepped key, key slot width and length may be different. May be used on 332, 352, 390, 427, 428, "FE" engines when the sleeve between the damper and the timing gear is shortened by .500", a .375" thick spacer is added between the damper and the pulley, and a stepped key is used.
Internally Balanced
Black Zinc Finish |