BBC Main Bearing Set Narrowed

The BBC Main Bearing Set Narrowed is specifically engineered for high-performance big-block Chevrolet engines that require precision bearing clearances and optimized journal fit. This bearing set is ideal for builders who are modifying BBC crankshaft geometry for tight clearance engine builds, competition applications, or specialized custom configurations.

Manufactured by ACL Bearings, this set utilizes premium copper-lead composite materials with controlled wall thickness to maintain structural integrity under extreme load cycles. The narrowed bearing width reduces radial thickness while preserving critical load-carrying capacity, allowing fitment in modified cranks where standard journal diameters have been altered. Each bearing is precisely machined to deliver consistent oil clearance and load distribution, which is crucial for high-performance applications.

Engine builders working with stroker cranks, journal-ground builds, or competition engines will find this bearing set particularly beneficial. Proper installation requires line honing and verification of clearance specifications, typically recommended between 0.0015" to 0.0025" depending on the application.