Innovators West | LSx Serpentine Race Damper – F-Body Offset

Innovators West LS Race Series SFI Harmonic Damper – 7.25" Serpentine

Part Number: #873F

Designed specifically for high-performance LS race applications, the Innovators West Harmonic Damper delivers exceptional crankshaft vibration control while maintaining OEM accessory compatibility. Featuring a 7.25" outer diameter and 6-rib serpentine drive configuration, this damper is engineered for serious naturally aspirated and turbocharged race engines where durability, timing accuracy, and reliability are critical.

Fully engraved timing marks allow for quick and accurate ignition timing adjustments, making this damper ideal for professional engine builders and racers. The unit comes standard with a GTO/F-Body length hub and features the popular GM 6-bolt pulley pattern (6 on 3.2") along with a BBC register that accepts most aftermarket BBC crank mandrels and pulleys.

For racers running mechanical oil pump drives, this damper is also available with an optional 28-tooth HTD oil pump drive gear on the rear of the assembly (Part #1128F).

Exceeding SFI 18.1 certification standards, the Innovators West LS Race Damper provides proven protection against harmful crankshaft harmonics while delivering the durability demanded in competitive motorsport environments.

Features & Benefits

• Purpose-built for LS race engine applications
• 7.25" diameter for superior harmonic control
• 6-rib serpentine drive configuration
• Fully engraved timing marks for accurate tuning
• Standard GTO/F-Body length hub
• GM 6-bolt pulley pattern (6 on 3.2")
• BBC register accepts most aftermarket BBC crank mandrels and pulleys
• Optional 28T HTD oil pump drive gear available (Part #1128F)
• Precision-machined for exceptional balance and durability
• Direct replacement for ATI #918852
• Exceeds SFI 18.1 certification requirements

Technical Specifications

• Outer Diameter: 7.25"
• Drive Type: 6-Rib Serpentine
• Weight: 10.7 lbs
• Keyway: Single 3/16"
• Hub Length: GTO/F-Body Length
• Pulley Pattern: GM 6-Bolt (6 on 3.2")
• SFI Certification: SFI 18.1 Approved

What's Included

• Innovators West LS Race Harmonic Damper
• Standard-duty hub assembly

Application Notes

• Suitable for LS-based race and performance engines
• Compatible with OEM and aftermarket serpentine accessory drives
• Accepts most aftermarket BBC crank mandrels and pulleys
• Optional Innovators West crank mandrel available separately (Part #947)
• Direct replacement for ATI #918852

Important Note

This damper is supplied with a standard-duty hub and is not intended for high-horsepower supercharged applications. For extreme belt-drive or supercharged combinations, please contact Prime Speedworks for the appropriate Innovators West solution.

Why Buy From Prime Speedworks

At Prime Speedworks, we don't just sell performance parts—we use them. Innovators West dampers have earned a reputation across drag racing, street performance, endurance racing, and high-horsepower engine programs worldwide. We supply products that have proven themselves in demanding motorsport environments, backed by technical support from people who understand what it takes to keep engines alive under serious load.