Ford FE 390 427 428 Internal Balanced Fluid Damper Harmonic Balancer SFI 18.1 All rockers feature large needle

All rockers feature large needle bearings and roller tips

These combinations start with a reliable Speedmaster 9

while increasing your engine performance

they replace your existing worn or damaged valve seats

not from sand molds

Ford FE 390 427 428 Internal Balanced Fluid Damper Harmonic Balancer SFI 18.1 All rockers feature large needleUsing 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.