ACL Bearings 4B8280-.25 Connecting Rod Bearing Set Oversize - 25mm

The ACL Bearings 4B8280-.25 Race Series Connecting Rod Bearing Set brings race-tested durability, precision engineering, and state-of-the-art metallurgy to high-performance engine builds. The trimetal design features a high-strength overlay plate with reduced thickness for improved fatigue resistance, backed by hardened steel for enhanced support and retention under extreme conditions. This .25mm oversized bearing set is designed for engines where crankshaft journals have been machined during rebuilds, ensuring proper fitment and optimal clearances.

Key Features:

• Hardened steel backs on all rod bearings to improve support of the bearing lining and assist with bearing retention in the housing
• Elimination of flash plating on the back of bearings to improve heat transfer and maximize grip between bearings and housing
• Increased eccentricity to compensate for bore distortion at high RPM and assist in the formation of hydrodynamic oil films
• Finely finished bearing surfaces to promote optimal oil film formation, reducing metal-to-metal contact and enhancing engine longevity
• Micron tolerance machining supported by precision measurement systems delivers consistent accuracy to key characteristics like wall thickness and crush

ACL Race Series performance engine bearings are recognized as a premier brand throughout the motorsports world, with rod and main bearings as standard components in race engines that have set records and won championships from Mexico to Bonneville. Whether building a high-output street engine or a dedicated competition powerplant, these bearings deliver the strength and precision needed to withstand elevated loads and RPMs.