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Fluidampr harmonic balancer adapter hub for externally balanced BBC Chevy 454–502ci engines accepts dual 1/4" keyways and fits Fluidampr part numbers #800121 and #80253E. Offered as the hub only, it provides the matching dual‑key configuration required for the listed externally balanced Big Block Chevy damper applications.
Fluidampr BBC Ext Balanced Dual (1/4in & 1/4in) Keyway Harmonic Balancer Adapter Hub (Hub Only)
