Ford FE 390 427 428 Internal Balanced Fluid Damper Harmonic Balancer SFI 18.1 These combinations start with a

These combinations start with a reliable Speedmaster 9

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All rockers feature large needle bearings and roller tips

not from sand molds

Fits big block Chevy rectangular port cylinder heads on standard deck blocks

Ford FE 390 427 428 Internal Balanced Fluid Damper Harmonic Balancer SFI 18.1 These combinations start with aUsing 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.