Speedmaster PCE291.1081 LS Harmonic Balancer Underdrive Damper 5.670" SFI 18.1

The Speedmaster PCE291.1081 is a harmonic balancer damper engineered for Chevy and GM LS-series engines. This 5.670" diameter damper features a 25% underdrive ratio and carries SFI 18.1 certification, meeting safety standards for high-performance applications. The underdrive design reduces parasitic drag on the crankshaft, improving overall engine efficiency and throttle response while maintaining vibration damping critical to engine longevity.

Ideal for street performance, restomod, and racing builds, this harmonic balancer integrates seamlessly with LS engine combinations. The SFI 18.1 rating ensures compliance for sanctioned motorsports competition. Quality construction and precise engineering make this damper a reliable upgrade for serious LS engine builders and enthusiasts seeking enhanced performance and reliability.

Key Features & Benefits

• 5.670" Diameter: Properly sized for LS-series engine applications.
• 25% Underdrive Ratio: Reduces parasitic load on the crankshaft for improved efficiency.
• SFI 18.1 Certified: Meets safety and performance standards for racing and high-performance use.
• Harmonic Damping: Controls crankshaft vibration to protect engine internals.
• Speedmaster Engineering: Built for durability and compatibility with LS engine platforms.

Specifications

Ideal Applications

• High-performance LS engine builds and upgrades
• Motorsports and sanctioned racing applications
• Street performance and restomod projects
• LS engine swaps and custom engine combinations