Fluidampr Pontiac 389 400 421 428 455 CID V-8 Steel Internally Balanced Damper 650401

FITMENT NOTE: Pontiac 326, 389, 400, 421, 428, 455 V8, internally balanced. 4 bolt pulley pattern on 3.300 bolt circle. Holes in pulley must be re-drilled, '69-later timing cover & pulley may be required on early models.

Normal stock damper wear and engine performance upgrades increase the naturally occurring characteristics of harmful crankshaft torsional vibrations. By installing a Fluidampr viscous damper you will reduce wear on the main bearings and timing gear, achieve more accurate valvetrain operation and lower the risk of crank failure. Unlike rubber based dampers, Fluidampr automatically adapts to your modifications, then continuously self-tunes in real time to optimum damping at both peak levels and across a broad, changing frequency range. Features precision machined and computer balanced components. Never needs to be tuned or rebuilt. SFI Approved. Made 100% in the U.S.A. ISO Certified.

Pontiac 326, 389, 400, 421, 428, 455
Engine:: Pontiac, Oldsmobile 326, 389, 400, 421, 428, 455 CID V8
Part #:: 650401
OD:: 6-5/8"
Bore Dia:: 1.3720"
Length:: 3.247"
Weight / lbs (Rotating Weight / lbs):: 10.2 (6.8)
Engine Type:: Internal
Finish:: Black Zinc Chromate