Pontiac V8 6.9 Harmonic Damper - Non-SFI

The Pontiac V8 6.9 Harmonic Damper from Professional Products is engineered for serious engine builders and street/strip enthusiasts running internally balanced Pontiac V8 powerplants. This non-SFI unit replaces the factory harmonic balancer with precision-engineered damping technology that controls crankshaft vibration at multiple frequency ranges—critical for engine longevity, consistent ignition timing, and reliable performance under high RPM and load conditions. Whether you're building a stock-displacement 350, 389, or 400-cubic-inch engine or pushing modified combinations to their limits, proper harmonic damping is non-negotiable.

Manufactured from steel with a black finish, this 6.900-inch outer diameter damper absorbs torsional vibrations that naturally occur as the crankshaft cycles through combustion events. The internal balance design means it's matched to internally balanced crankshafts—eliminating the need for external balance weights and simplifying installation on freshly built or rebuilt engines. The 8.9-pound assembly fits snugly within compact engine bays and integrates seamlessly with standard Pontiac V8 timing covers and accessory drive systems. Professional Products' reputation for OEM-quality manufacturing ensures this damper maintains concentricity and elastomer integrity through thousands of heat cycles.

This component is ideal for both stock restoration and performance builds using internally balanced crankshafts in Pontiac V8 engines. Installation requires removal of the old balancer and is typically paired with a new timing cover gasket and harmonic balancer bolt. Because this unit is non-SFI certified, it's suitable for street cars, bracket racing, and vintage drag racing where SFI approval isn't mandated—verify local sanctioning body rules if competing in organized events. Proper torque specifications and alignment during installation are essential to maximize damping effectiveness and prevent premature wear on crankshaft snouts.