Assault Racing 6.4 Small Block Ford Harmonic Balancer Damper 50 oz SBF 302 351W. Assault Racing Products Harmonic Balancer. Small Block Ford V8 – Externally Balanced. 302 5.0L Late 1981- 1995. KMJ Performance is proud to sell the Assault Racing SB Ford Harmonic Balancer! Our SB Ford Dampers have more universal features than any other …