Ford 429 460 SFI 18.1 Harmonic Balancer Fluid Damper Internal [Chrome] Convert any one-piece GM TH400

Convert any one-piece GM TH400 case into a two-piece case with our Speedmaster TH400 case adapter

improve starting

With an adjustable vintage plastic snapback closure

making it a strong upgrade for performance builds

Ford 429 460 SFI 18.1 Harmonic Balancer Fluid Damper Internal [Chrome] Convert any one-piece GM TH400Using only three parts a laser welded sealed housing, an internal inertia ring, and highly viscous silicone fluid between the two these SFI approved Fluid dampers can control all crankshaft vibration, not just a limited frequency range. As a result, you get reduced wear on the main bearings and timing gear, more stable valvetrain operation, and less chance of crank failure.