These are externally balanced dampers withbolt in counterweights which can be removedfor a neutral balance engine.This damper hasboth the stock Olds pulley bolt pattern as wallas big block Chevy.TDC mark must berepositioned for 330's and damper fits onyl thelate 400 and 425 only.

Look at this list of competitive advantages over any other harmonic damper:

Price - Yes, there are less expensive street and SFI specification damper, but not at this quality level, nor can they match the other features that our damper price range.

Application – Our damper provide more applications for a wider range of engines than any other harmonic damper in our price range.

Universality – We are able to fit more applications with fewer part numbers than any other damper line. That’s because our damper more universal, allowing one damper to fit a wide range of engines, we fit engines that no one else does.

Quality – Despite our extremely attractive prices, the quality of our damper is equal to, or in most cases, exceeds that of any other harmonic damper. You won’t find any damper that is more accurately balanced or more closely machined for the correct fit than our harmonic dampers.

Bonded Construction – All of our dampers feature a bonding process which adheres the elastomer to the I.D. of the inertia ring and O.D. of the hub. We have perfected a new process that utilizes a stronger adhesive along with an improved elastomer that creates a much stronger bond. Our current design is practically indestructible.