GM LSX Black Steel High Performance SFI Harmonic Balancer/Damper

• Fits GM Gen III/IV LS-based 4.8L, 5.3L, 5.7L, 6.0L and 6.2L engine applications

• 6.325 in. internal-balance steel elastomer harmonic balancer for LS performance builds

• Controls crankshaft vibration and reduces harmful harmonics for improved durability

• SFI 18.1 certified with 360° timing marks for high-performance street and racing use

Upgrade your GM Gen III/IV LS-based engines with a SFI-certified performance harmonic balancer designed to control crankshaft vibration and reduce harmful harmonics across the RPM range. Built for street and performance applications, this 6.325 in. balancer improves engine stability, durability, and overall reliability.

Vibration Control & Engine Protection
Designed to dampen crankshaft harmonics, this balancer helps reduce engine wear and improve long-term reliability—especially in performance and high-RPM applications.

Durable Performance Construction
Steel and elastomer construction provides dependable damping and strength, while SFI certification supports high-performance and racing applications.

Easy Timing & Installation
360 deg. timing marks simplify ignition setup, while the 6.325 in. diameter supports proper accessory alignment and straightforward installation.

Built for Street & Performance Applications
Ideal for performance rebuilds, restorations, and upgraded engine combinations where crankshaft stability and consistent operation are critical.

What engines is this harmonic balancer compatible with?
This harmonic balancer is designed for COMPATIBLE WITH, CHEVROLET SMALL BLOCK V8 GEN. III/IV (LS BASED), 4.8 L / 293 in3, 5.3 L / 325 in3, 5.7 L / 346 in3, 6.0 L / 364 in3, 6.2 L / 376 in3.

What does a harmonic balancer do?
A harmonic balancer helps reduce engine vibration and protects internal engine components by dampening crankshaft harmonics.

What engine balance is this harmonic balancer designed for?
This balancer is designed for internal engines, so it should match your engine's balance configuration.

Does this harmonic balancer include timing marks?
Yes, this balancer includes 360 deg. to assist with accurate ignition timing setup.

Is this harmonic balancer suitable for performance applications?
Yes, this harmonic balancer is designed for performance use, but SFI certification should be confirmed if required for racing.

What material is this harmonic balancer made from?
It is made from steel, which provides strength and durability for engine operation.

Is this a good upgrade over a stock harmonic balancer?
Yes, a performance harmonic balancer can improve engine reliability and help manage vibrations better than worn or stock units.

Do I need to verify fitment before installation?
Yes, you should always verify engine balance, diameter, and application compatibility before installing a harmonic balancer.

Does the black finish affect performance?
No, the finish is cosmetic and does not affect the balancer's performance—it mainly changes appearance.