Clevite CB-663A-1 Engine Connecting Rod Bearing Pair

OE Replacement Engine Bearing Pair

Clevite CB-663A-1 is an OE replacement engine connecting rod bearing pair built for applications that require a .001 in undersize bearing. It is engineered for direct replacement use in a wide range of Chevrolet and GMC engines, including Silverado 1500, Sierra 1500, and Tahoe applications.

Key Features

• OE replacement bearing grade for factory-style service
• Bi-metal aluminum construction with 100% lead-free aluminum silicon
• 60% more silicon than comparable competitive replacements
• Improved journal surface conditioning for reduced wear
• Meets or exceeds original equipment manufacturer specifications
• .001 in undersize for matched engine rebuild applications
• Clevite CB-663A-1 part number for accurate ordering

Product Details

Clevite CB-663A-1 uses the brand’s A Series aluminum bearing design and AL-5 bearing material to deliver a precise fit for undersize engine rebuild work. The bearing’s aluminum-silicon composition is formulated to improve journal conditioning while increasing seizure and wear resistance. This makes it a practical choice for engine service where bearing clearance and surface finish must be controlled carefully. This part cross-references Sealed Power 2555A1 for the same application.

Compatible With Chevrolet and GMC engine applications across a broad range of trucks, SUVs, vans, and performance models, including Silverado, Sierra, Suburban, Tahoe, and Yukon platforms. The CB-663A-1 is also listed for select Cadillac, Buick, Pontiac, Hummer, Isuzu, Workhorse, and other GM-based applications. If you are sourcing a Clevite CB-663A-1 bearing for a Chevrolet Silverado 1500 or GMC Sierra 1500 rebuild, verify the undersize requirement before installation.

Common Issues This Part Addresses

• Excessive crankshaft journal wear during engine rebuilds
• Incorrect bearing clearance from standard-size replacement parts
• Surface scoring caused by worn or damaged rod bearings
• Seizure risk in high-load engine service
• Need for OE-style undersize bearing selection

Installation Notes

Confirm crankshaft journal measurements, housing bore dimensions, and required undersize before installation. This bearing is specified as .001 in undersize, so it should be matched to the engine’s measured clearances during rebuild work. Clean all bearing surfaces thoroughly and follow the engine manufacturer’s service procedures for torque, lubrication, and clearance checks. The CB-663A-1 is intended for professional engine assembly practices.

Quality Assurance

Clevite designs these bearings to meet or exceed original equipment manufacturer specifications. The bi-metal aluminum construction and lead-free aluminum silicon formulation are engineered for durability, wear resistance, and dependable engine service.