1963-1996 6.4″ Small Block Ford Harmonic Balancer Damper 28.4oz SBF 289 302 351W
6.4″ Small Block Ford Harmonic Balancer Damper 28.4oz SBF 302 351. The dampers have both the early 3-bolt accessory pulley bolt pattern and the later 4-bolt as well. This will allow the use of late model serpentine drive systems on early engines if desired.