You might want to pull it off and measure it,your damper length should be 3.400" if it is 3.875 you have a damper that is supposed to be a 351W or 302 H.O. with the Ford Racing .917 crank sprocket.That damper can be used on a 351C with the above sprocket but requires having .070" machined off.This was noted on the instruction sheet that came with my balancer.If you still have the old stock ...



