Up for auction is this brand new harmonic balancer ( damper ) from ATI for General Motors/Chevrolet Big Block applications with EXTERNAL BALANCING. This means that it fits all Big block style engines that were originally externally balanced like 454 and 502 based engines, and will work on other big block engines when using an externally balanced crankshaft and proper flexplate or flywheel. Part # is 917740. This is a 7.074 diameter lightweight 3-ring steel balancer.

This part has never been taken out of the package. This damper retails for more $500-, so this is a great deal!

The patented ATI Super Damper is the only crankshaft damper designed exclusively for high performance engines.

Features:
- Eliminates torsional crankshaft vibrations
- Exceeds SFI 18.1 specs
- Black zinc chromate finished
- Tunable, rebuildable, and extremely efficient at ALL RPM
- Laser engraved 360 timing marks (most applications)