Perfect Circle CB758P40 Connecting Rod Bearing Undersize - 040

The Perfect Circle CB758P40 is a high-quality connecting rod bearing designed for Pontiac V8 engines from 1956-1979, including 316, 326, 347, 350, 370, 389, 400, 403, 421, 428, and 455 cubic inch displacements. This bearing features .040" undersize dimensions for use with reground or undersized crankshaft journals during engine rebuilding.

Key Features:

• Tri-metal construction with steel backing, copper-lead intermediate layer, and electroplated lead-tin-copper overlay
• P-Series design ideal for high-revving engines and demanding applications
• Higher eccentricity and crush factor to compensate for rod bore distortion at high RPM
• Standard shaft diameter: 2.333"-2.334" (for .040" undersize)
• Bearing OD: 2.4995"-2.5000"
• Maximum wall thickness: 0.0622"
• Recommended oil clearance: 0.0016"-0.0041"

Perfect Circle bearings, now part of the MAHLE/Clevite family, offer superior load capacity compared to bi-metal designs and are suitable for heavy-duty, motorsports, and street performance applications. The P-Series is the most versatile replacement bearing for OE applications and provides proven durability in high-performance engine builds.