8" SBC 400 Harmonic Damper

Small Block Chevy 400 Harmonic Damper Harmonic Damper This damper is intended for use on externally balanced 383 or 400 small block Chevy engines. They feature a bolt-in counterweight which can be removed for neutral balance applications. These dampers are actually identical to the 80002 and 90002, except they also include the bolt-in counterweight. Both dampers have 60.