Speedmaster PCE291.1077 Chevy BBC 396 427 7.000" Internal Balanced Harmonic Damper SFI 18.1

The Speedmaster PCE291.1077 is an internal balanced harmonic damper designed specifically for Chevrolet Big Block (BBC) 396 and 427 cubic-inch engines. This 7.000" diameter damper absorbs torsional vibration from the crankshaft, reducing noise, protecting engine bearings, and extending engine life. The unit is SFI 18.1 certified, meeting safety standards for performance and racing applications.

This internal balanced harmonic damper is engineered for BBC engines that have been internally balanced, ensuring proper weight distribution and vibration control. It is commonly used in street performance, rebuild, and racing applications where engine longevity and reliability are critical. The balanced design works seamlessly with stock and modified BBC power plants, providing consistent damping across a wide RPM range.

Key Features & Benefits

• Internal Balanced Design: Purpose-built for internally balanced Chevy BBC 396/427 engines with optimized weight distribution.
• 7.000" Diameter: OEM-specification size engineered for proper crankshaft fit and vibration control.
• SFI 18.1 Certified: Meets SFI Foundation safety standards for performance and racing engine applications.
• Torsional Vibration Reduction: Absorbs crankshaft oscillation to protect bearings and reduce engine noise.
• Speedmaster Quality: OEM-quality manufacturing designed for reliability in street and competition environments.

Specifications

Ideal Applications

• BBC engine rebuilds and refresh projects
• Street performance and daily-driver Chevy Big Block applications
• Racing and high-RPM competition engines
• Crate engine installations requiring balanced damping