Internal Chrysler 383, 426, 440 CID 426 Hemi B/RB Steel Black Zinc O.D. 7-1/4" 720311

Using only three parts--a laser-welded sealed housing, an internal inertia ring, and highly viscous silicone fluid between the two--these SFI-approved Fluidamprs can control all crankshaft vibration, not just a limited frequency range. As a result, you get reduced wear on the main bearings and timing gear, more stable valvetrain operation, and less chance of crank failure.