Fluid Damper - SFI Certified - Chrome

These "440 Source" fluid dampers have an internal ring surrounded by a thin film of high viscosity silicone fluid, which allows the ring to rotate freely within the housing on nylon positioning guides.

This allows the outer shell to "spin up" faster then the ring as the engine accelerates, which increases horsepower by reducing the amount of weight the engine has to move by over 33% compared a standard elastomer type balancer.

Also, the housing is a one piece laser welded design, so there is never any danger of the ring coming loose or timing marks slipping.

These dampers are for internal (neutral) balance engines only, they will not work for factory cast crank (externally) balanced engines.


Fits all 383, 400 and 440 Dodge / Plymouth engines (And "440 Source" Stroker kits) with internal balance.

SFI Rating 18.1

These include printed timing marks to 50 degrees, and a symmetrical pulley bolt pattern. We have designed these dampers based on detailed factory specifications, to be sure there will be no problems with fit or finish.

These are quality approved dampers. 440 Source is an official SFI approved participating manufacturer. The SFI foundation performs destructive testing on sample fluid dampers to ensure that the steel and methods of construction used meets their stringent requirements. Our fluid dampers not only passed the testing, but far exceeded SFI's minimum specs. Our yield strength was 52,000 pounds (over 30% stronger than required). Our tensile strength was an amazing 97,000 pounds (over 60% stronger than required) and our elongation was 25% (2.5 times the required minimum!)

Not only do you get this kind of GUARANTEED quality, but you get it at a fraction of the cost of the name brand units.