Chevy Big Block 396-427 8" SFI Certified Gloss Black Harmonic Balancer

• Fits Chevy Big Block 396, 402 and 427 Mark IV harmonic balancer applications

• 8.000 in. gloss black internal-balance steel elastomer damper for BBC performance builds

• Controls crankshaft vibration and reduces harmful harmonics for improved durability

• SFI 18.1 certified with 60° BTDC to 0° TDC timing marks for racing use

Upgrade your Chevy Big Block 396-427 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 8.000 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
60 deg. Before Top Dead Center To 0 deg. Top Dead Center timing marks simplify ignition setup, while the 8.000 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 BIG BLOCK V8 GEN. II (MARK IV), 6.5 L / 396 in3, 7.0 L / 427 in3, 6.6 L / 402 in3, NOTE: Fits applications with three crankshaft pulley bolt holes..

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 60 deg. before top dead center to 0 deg. top dead center 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.