Ford 429 460 SFI 18.1 Harmonic Balancer Fluid Damper Internal [Chrome] They are installed between the

They are installed between the water pump pulley and the drive flange

High-volume water pumps have a ribbed aluminum housing and a heavy duty ball/roller bearing assembly

classic design

Flat surfaces are finished with CNC machine center for accuracy and smoothness

but with several important modifications

Ford 429 460 SFI 18.1 Harmonic Balancer Fluid Damper Internal [Chrome] They are installed between theUsing 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.