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Fluidampr harmonic balancer adapter hub for internally balanced BBC Chevy 396–427ci engines accepts dual 1/4" keyways and fits Fluidampr part numbers #800151 and #80256E. Supplied as the hub only, it provides the dual‑key configuration and internal balance compatibility called out for the listed Big Block Chevy damper assemblies.
Fluidampr BBC Int Balanced Dual (1/4in & 1/4in) Keyway Harmonic Balancer Adapter Hub (Hub Only)
