Product Description
Genuine GM Harmonic Damper / Crank Bolt for LS7 & Dry Sump LS Engines
Fits GM LS7, Dry Sump LS3, LS9, LT4 & LT5 Engines | GM Part #11570163
The Genuine GM 11570163 Harmonic Damper Crank Bolt is a factory replacement fastener designed specifically for GM LS7 and dry sump LS-based engines, including LS3 dry sump, LS9, LT4, and LT5 applications. This bolt secures the harmonic balancer (also known as the crank pulley) to the crankshaft and is critical for maintaining proper damper retention and crankshaft integrity. Manufactured from high-quality, heat-treated steel, this bolt is engineered to meet GM’s torque-to-yield specifications and must be replaced any time it is removed.
Key Features & Benefits
- Critical for Proper Harmonic Balancer Retention: Secures the crank pulley/harmonic damper to the crankshaft, ensuring correct alignment and vibration control in high-performance dry sump LS engines.
- Designed for Dry Sump LS Applications: Engineered specifically for LS7 and dry sump LS3 configurations, as well as LS9, LT4, and LT5 engines requiring this unique crank bolt design.
- OEM GM Quality & Heat-Treated Strength: Manufactured from high-quality steel and heat-treated to withstand the extreme clamping loads required by torque-to-yield fasteners.
- Torque-to-Yield Safety Design: Factory LS harmonic balancer bolts are torque-to-yield and stretch during installation, ensuring proper clamping force when installed to GM specifications.
- Must Be Replaced After Removal: Not reusable by design; replacing the bolt during damper service prevents failure, loosening, or crankshaft damage.
Key Fitments
- GM LS7: Dry sump applications
- GM LS3: Dry sump configurations only
- GM LS9: Supercharged dry sump engines
- GM LT4: Dry sump performance engines
- GM LT5: Dry sump high-performance applications
