Oldsmobile 455 6.625" External Balanced Fluid Damper Harmonic Balancer SFI 18.1 Speedmaster bearings are engineered with

Speedmaster bearings are engineered with precision to provide superior quality

modeled off OE castings for factory fit and finish

a C5 Corvette hub bearing pack

and friction management

Oldsmobile 455 6.625" External Balanced Fluid Damper Harmonic Balancer SFI 18.1 Speedmaster bearings are engineered withUsing 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.