ATI Damper 6.78in Aluminum 6-Groove 3 Ring (19661996 B-Body Impala / Caprice LT1) ATI917327
Precision Aluminum Harmonic Damper for B-Body Impala & Caprice LT1 Engines
The ATI 6.78-inch Aluminum Super Damper (part ATI917327) is built for Chevrolet B-Body platforms using the LT1 engine, including the Impala SS and Caprice from 1966 through 1996. This 3-ring, 6-groove aluminum damper delivers exceptional torsional control and reduces crankshaft vibration, ensuring smoother power delivery and long-term reliability. Designed for both street performance and high-RPM use, its a proven upgrade over factory units in any Big Body LT1 build.
Performance Highlights
- 6.78-inch outer diameter for compact, efficient harmonic control
- Lightweight aluminum shell enhances throttle response and reduces rotational mass
- 6-groove pulley maintains OEM accessory alignment and belt routing
- 3-ring Super Damper design provides consistent vibration damping through the RPM range
- Perfect for LT1-powered Impala SS, Caprice, and other B-Body builds
- SFI 18.1 certified and fully rebuildable for long-term performance
Quick Specs
- Outer Diameter: 6.78 inches
- Material: Aluminum
- Design: 3-Ring Super Damper
- Pulley Layout: 6-Groove
- Certification: SFI 18.1
- Engine Compatibility: LT1
- Vehicle Platform: Chevrolet B-Body (Impala / Caprice)
- Part Number: ATI917327
Why Choose ATIs B-Body LT1 Super Damper?
The ATI917327 Aluminum Super Damper is the result of decades of engineering refinement. It offers precision balance and unmatched crankshaft stability for LT1 engines, protecting against torsional stress that can rob horsepower and damage internals. Whether your build is a daily driver, cruiser, or high-output street machine, this damper ensures smooth, consistent performance at any RPM.
Frequently Asked Questions
Is this damper a direct replacement for the OEM LT1 damper?
Yes. Its a direct bolt-on replacement for LT1-equipped B-Body cars using the standard 6-rib accessory drive.
Does this damper require rebalancing?
No. ATI Super Dampers are factory-balanced and ready for installation out of the box.
Will it fit earlier B-Body models with LT1 engine swaps?
Yes. Its compatible with LT1 retrofit applications in older Impala or Caprice chassis from 1966 through 1990.
Is this damper suitable for forced-induction setups?
Yes. It can safely handle mild forced induction or nitrous applications where additional crank stability is critical.
Can it be rebuilt or serviced?
Yes. All ATI Super Dampers are fully rebuildable using replacement components directly from ATI.
Vehicle Fitment
- 1966 Chevrolet Impala LT1
- 1966 Chevrolet Caprice LT1
- 1967 Chevrolet Impala LT1
- 1967 Chevrolet Caprice LT1
- 1968 Chevrolet Impala LT1
- 1968 Chevrolet Caprice LT1
- 1969 Chevrolet Impala LT1
- 1969 Chevrolet Caprice LT1
- 1970 Chevrolet Impala LT1
- 1970 Chevrolet Caprice LT1
- 1971 Chevrolet Impala LT1
- 1971 Chevrolet Caprice LT1
- 1972 Chevrolet Impala LT1
- 1972 Chevrolet Caprice LT1
- 1973 Chevrolet Impala LT1
- 1973 Chevrolet Caprice LT1
- 1974 Chevrolet Impala LT1
- 1974 Chevrolet Caprice LT1
- 1975 Chevrolet Impala LT1
- 1975 Chevrolet Caprice LT1
- 1976 Chevrolet Impala LT1
- 1976 Chevrolet Caprice LT1
- 1977 Chevrolet Impala LT1
- 1977 Chevrolet Caprice LT1
- 1978 Chevrolet Impala LT1
- 1978 Chevrolet Caprice LT1
- 1979 Chevrolet Impala LT1
- 1979 Chevrolet Caprice LT1
- 1980 Chevrolet Impala LT1
- 1980 Chevrolet Caprice LT1
- 1981 Chevrolet Impala LT1
- 1981 Chevrolet Caprice LT1
- 1982 Chevrolet Impala LT1
- 1982 Chevrolet Caprice LT1
- 1983 Chevrolet Impala LT1
- 1983 Chevrolet Caprice LT1
- 1984 Chevrolet Impala LT1
- 1984 Chevrolet Caprice LT1
- 1985 Chevrolet Impala LT1
- 1985 Chevrolet Caprice LT1
- 1986 Chevrolet Impala LT1
- 1986 Chevrolet Caprice LT1
- 1987 Chevrolet Impala LT1
- 1987 Chevrolet Caprice LT1
- 1988 Chevrolet Impala LT1
- 1988 Chevrolet Caprice LT1
- 1989 Chevrolet Impala LT1
- 1989 Chevrolet Caprice LT1
- 1990 Chevrolet Impala LT1
- 1990 Chevrolet Caprice LT1
- 1991 Chevrolet Caprice LT1
- 1992 Chevrolet Caprice LT1
- 1993 Chevrolet Caprice LT1
- 1994 Chevrolet Impala SS LT1
- 1994 Chevrolet Caprice LT1
- 1995 Chevrolet Impala SS LT1
- 1995 Chevrolet Caprice LT1
- 1996 Chevrolet Impala SS LT1
- 1996 Chevrolet Caprice LT1
Contact Beefcake Racing
Beefcake Racing is your source for ATI Super Dampers and GM performance components. For expert fitment help or to place an order, email sales@beefcakeracing.com or call 1-855-827-7223. Our performance specialists can help you select the perfect damper for your build.
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