Ford FE 390 427 428 Internal Balanced Fluid Damper Harmonic Balancer SFI 18.1 They feature lightweight construction with

They feature lightweight construction with a thick rail for gasket support

The body is alloy machined finish

and highly viscous silicone fluid between the two--these SFI-approved Fluid dampers can control all crankshaft vibration

Speedmaster 40th Anniversary Black and White button down shirt

Speedmaster Aluminum Roller Rockers are extruded from 6061 T6 Aluminum

Ford FE 390 427 428 Internal Balanced Fluid Damper Harmonic Balancer SFI 18.1 They feature lightweight construction 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.