ATI 917371 Super Damper for 2001-2005 6.6L Duramax (LB7/LLY)

Vehicle Fitment

• 2001-2005 Chevrolet / GMC 6.6L Duramax Diesel (LB7 / LLY)

Features

• Reduces torsional crankshaft vibrations for improved engine longevity
• SFI 18.1 certified for performance and competition use
• Steel shell construction for durability and mass
• 360° laser-etched timing marks for precise ignition tuning
• Externally balanced design matched to LB7/LLY engine requirements
• Rebuildable elastomer core for long-term serviceability
• Tunable damper to adapt to power upgrades or custom engine builds
• Black zinc-chromate finish for corrosion resistance

Specifications

• Part Number: **ATI 917371**
• Outer Diameter: ~ 7.53" (191.3 mm)
• Groove Count: 6 ribs
• SFI Rating: 18.1
• Engine Balance Type: External
• Degree Markings: 360°
• Material: Steel shell, elastomer core
• Mounting Hardware: Not included

Included Components

• 1x ATI 917371 Super Damper (steel, 6-rib)

Product Description

The **ATI 917371** Super Damper is a precision-engineered harmonic balancer specifically designed for the 6.6L Duramax Diesel LT-series (LB7 / LLY) engines from 2001 to 2005. Its robust steel shell and elastomer core help absorb damaging torsional crankshaft vibrations, protecting your engine at high loads.

Certified to SFI 18.1 standards, the 917371 is built for performance and durability. With 360° laser-etched timing marks, this damper supports precise ignition timing and tuning. Its external balance design is matched to the factory specifications for LB7 and LLY Duramax engines.

This Super Damper is serviceable and rebuildable, making it ideal for owners who tune or upgrade their engines. Designed for longevity, it helps improve engine response, reduces wear, and is a smart upgrade for anyone building or maintaining a performance Duramax diesel drivetrain.