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and highly viscous silicone fluid between the two--these SFI-approved Fluid dampers can control all crankshaft vibration
heat-treated to the highest Rockwell hardness available
Speedmaster has already done the work for you
The body is alloy machined finish
Replacement Spring Isolator for PC12004 A-Arms
Ford FE 390 427 428 Internal Balanced Fluid Damper Harmonic Balancer SFI 18.1 and highly viscous silicone fluidUsing 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.
US$ 79.99
US$ 199.90
