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The Fluidampr BBC internal-balance harmonic balancer adapter hub is a hub-only replacement for Chevy 396–427ci internal-balance engines, offering dual keyway compatibility (3/16" and 1/4"). It helps preserve vibration control after repeated damper removal and installation by maintaining the recommended press-fit tolerance of 0.0005"–0.0015". Fits Fluidampr part numbers 800131 and 80257E.
Fluidampr BBC Int Balanced Dual (3/16in & 1/4in) Keyway Harmonic Balancer Adapter Hub (Hub Only)
