Fluidampr BBC Int Balanced Dual (3/16in & 1/4in) Keyway Harmonic Balancer Adapter Hub (Hub Only) - 100012

Repeat damper removal and installation can reduce vibration control. Maintain recommended Fluidampr press fit of 0.0005" - 0.0015". Fits Fluidampr #800131 and #80257E. Chevy 396-427ci, internal balance, dual key (3/16" and 1/4").