Ford 429 460 SFI 18.1 Harmonic Balancer Fluid Damper Internal [Chrome] They're precision-machined from T6-106 billet

They're precision-machined from T6-106 billet aluminum

Applications available in 8

and less chance of crank failure

making it a strong upgrade for performance builds

Speedmaster manufactures these master cylinders from quality materials to ensure proper fitment

Ford 429 460 SFI 18.1 Harmonic Balancer Fluid Damper Internal [Chrome] They're precision-machined from T6-106 billetUsing 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.