Our Viper damper was developed due to many requests from our customers for a reasonably priced SFI specification damper for racing applications. The result is a design that will directly replace the stock damper but is made of near bulletproof 1045 steel and also includes a positive retention plate to keep the inertia ring in place in the unlikely event of damper failure. This damper duplicates the stock dimensions and also includes a keyway for those enthusiasts who prefer to add a keyslot in the crankshaft to provide extra safety.

This damper is supplied as a neutral balance damper and comes with three bolt-in counterweights. This allows this one part number to fit four different small block Chrysler engines. The damper without any weight fits internally balanced 1967 and later 318 V8's standard and Magnum, and all internally balanced 273 and 340 engines with forged cranks. One weight is for 340 externally balanced 1972-’73 engines with a cast crank. A different weight is for 360 externally balanced 1993-’97 engines with a cast crank. And the third weight is for 360 externally balanced 1971-’92 engines with a cast crank. Each counterweight is numbered, and the instructions guide you which weight to use for each style of engine.

This damper is supplied as a neutral balance damper with two counterweights with the damper. 1972-'78 383 & 400, '71 383 2-bbl and '74-'78 440 (cast crank engines only) use counterweight #91015. 1970-'71 440 6-bbl and the 1971 High Performance 440 use counterweight #91016. All other Chrysler big blocks require no weight. The damper also has two extra TDC marks for either the 426 street or race Hemi. To fit the Hemi, spacer #81013 is also required. This damper will not work on the 331, 354, or 392 early Hemi but basically fits all other big block Chrysler engines including the 351, 361, 383, 400, 413, 426 and 440. Complete instructions are included with the damper.

Professional Products now has available the first affordable harmonic damper for this great new engine from Chrysler. Now being used in many street rods, street machines or in engine swaps, this engine has lots of performance potential and that means it needs a high quality performance harmonic damper.We offer both our Powerforce model for high performance street applications as well as our Powerforce+Plus model which meets SFI spec #18-1 and is suitable for racing applications and particularly where the sanctioning body requires an SFI specification damper. The street model is made of tough nodular iron while the Powerforce+Plus SFI spec race model is made of 1045 steel.
Available June 2008.

These are among the very few high performance dampers available for this engine and by far the least expensive. Our Powerforce model for high performance street applications is the only damper of this type available for this engine. The Powerforce+Plus is designed as a racing damper (but is more than suitable for street use as well) and meets SFI specfication #18-1 which is a requirement at most racing venues. As with all our Powerforce high performance street dampers, this model is made of tough nodular iron while the Powerforce+Plus SFI spec racing model is made of 1045 steel, both the hub and the ring. These dampers feature a special high performance elastomer bonded to the metal.
Available June 2008.