Piston Pin Bushing Small Block

The piston pin bushing small block is a precision internal engine component designed for small block Chevrolet engines and similar platforms requiring wrist pin support. This bronze bushing isolates and guides the piston pin as it reciprocates within the connecting rod eye, absorbing lateral loads and reducing wear on both the pin and rod bore. For serious engine builders, restorers, and high-performance enthusiasts, a quality piston pin bushing is non-negotiable when assembling or refreshing a small block platform—it's the difference between an engine that lasts 100,000 miles and one that grenades at half that.

This small block variant features a 0.926 inch inner diameter, 0.975 inch outer diameter, and 0.962 inch length, machined from bronze for superior load-carrying capacity and reduced friction compared to cast iron. Bronze's self-lubricating properties and lower modulus of elasticity mean the bushing conforms slightly to the pin under load, distributing pressure more evenly and protecting against galling and seizing. The natural finish requires proper installation technique—the bushing must be pressed into the connecting rod eye with a dedicated bushing tool to avoid cocking or off-axis seating, which would compromise concentricity and accelerate failure.

Mechanics and engine builders restoring small block Chevy engines—whether stock 350 applications or modified 383/427 builds—rely on this bushing during bottom-end assembly. It's equally essential for vintage racing engines, marine blocks, and any small block variant where connecting rod pin wear or noise indicates bushing replacement. After pressing, the bushing bore must be honed to final pin clearance (typically 0.001 to 0.0015 inch) to ensure smooth, quiet operation and prevent premature wear. Sold individually, multiple units may be required depending on engine configuration.