Crank Hub & Inner Shell BBC Ext. Balance

The Crank Hub & Inner Shell BBC Ext. Balance from ATI Performance is a precision-engineered component specifically designed for Big Block Chevrolet engines with external balance configurations. This product is ideal for serious engine builders and mechanics who are working on high-performance builds. It plays a critical role in ensuring proper harmonic balance and reducing destructive vibrations that can compromise engine longevity.

This crank hub assembly features a precisely weighted inner shell that counterbalances rotating mass, which is essential for BBC engines that rely on external balance rather than internal counterweight design. It integrates seamlessly with your harmonic balancer and front damper system to absorb and distribute torsional vibrations across the crankshaft assembly. The manufacturing standards upheld by ATI Performance ensure dimensional accuracy and concentricity, preventing runout issues that could lead to rough idling or excessive vibration.

Engine builders restoring or modifying Big Block Chevrolet applications—including 427, 454, and 502 cubic inch variants—will find this component invaluable. Its compact dimensions and weight are consistent with the requirements for proper balance calculations, making it a reliable choice for high-performance engine applications.