Engine Kits

6.9" Damper for ' 61-79' Pontiac 326, 350, 389, 400, 421, 428, 455
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6.9" Damper for ' 61-79' Pontiac 326, 350, 389, 400, 421, 428, 455

Part #: 90020
List Price: $319.98
Our Price: $159.99
You Save: $159.99

Availability: In Stock

6.9" Damper for ' 61-79' Pontiac 326, 350, 389, 400, 421, 428 and 455 engines.This damper is dimensionally the same as the 1969 through 1979 stock damper. To fit this damper on a 1961-'68 engine requires the use of '79 or later timing chain cover, water pump and related accessories.This damper has the stock accessory pulley bolt circle plus a BB Chevy accessory bolt circle.

PowerForce+Plus Race Dampers are made from bulletproof 1045 steel. These dampers are designed to be installed on race engines that may rev over 10,000 rpm. Optimum damping occurs in the 6500 to 7500 rpm range. The machine work on these dampers is second to none and the critical fit tolerances and balance are held more closely than OEM. All externally balanced dampers feature bolt-in counterweights. This feature allows for swapping weights between dampers (Ford) or adding them to internal balanced dampers (Chevy) if you change applications. The basic damper in any family is the same with either a different counterweight (Ford) or an added counterweight (Chevy). This provides an unlimited amount of flexibility. Plus, you can't buy a more accurately balanced damper.

What is Bonding?When dampers are bonded, what does this mean? It means that the elastomer (rubber) that is sandwiched between the ring and the hub is bonded, or vulcanized, to metal. This is similar to the process used to bond the metal motor mounts to the rubber vibration isolaters used in these mounts.  This greatly increases the safety of the damper as most stock, and many inexpensive aftermarket dampers, are just pressed together and under heavy duty applications, the ring can rotate, moving your TDC mark from the true position, or fly off the engine. And that is very bad!



Balance Style Neutral
Brand Professional Products
Degree Marking Range 60 BTDC to 0 TDC
Degree Markings Yes
Engine Balance Internal
Harmonic Balancer Construction Elastomer
Harmonic Balancer Finish Black anodized
Harmonic Balancer Material Steel
Mounting Hardware Included No
Notes All 1961 to 1968 applications require 1969 or later timing chain cover, water pump, pulleys, and related accessories.
Outside Diameter (in) 6.900 in.
Part Type Harmonic Balancers
Product Line Professional Products PowerForce Plus Harmonic Dampers
Quantity Sold individually.
Safety Rating SFI 18.1

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