ACL Bearings 8B663HXC-STD Coated Rod Bearing Set for Chevy SBC/LS Engines

The ACL Bearings 8B663HXC-STD is a premium coated rod bearing set designed for Small Block Chevy and LS engines with .001 inch extra oil clearance, ideal for polished crankshaft journals and high-performance applications. ACL RACE Series performance engine bearings are recognized as a premier brand throughout the motorsports world, with RACE Series rod bearings serving as standard components in engines that have set records and won championships from sport compact drift racing to NASCAR, IHRA and NHRA competitions.

Key Features:

• CT-1 dry film lubricant coating helps reduce friction and abrasive wear, provides intermittent dry lubrication unaffected by dust or dirt, and is specifically engineered to withstand extreme conditions of high-performance engines
• 0.025mm (.001 inch) extra clearance specification optimized for polished journals
• High-performance tri-metal engine bearings designed to withstand higher RPM conditions with a high-strength overlay plate and reduced thickness for improved fatigue properties
• Hardened-steel backings with thin overlays and high crush factor, plus medium level of eccentricity
• Standard width shells with enlarged chamfers to provide clearance for most aftermarket crankshaft fillet radii
• Manufactured to exacting tolerances with particular attention paid to wall thickness accuracy, ensuring reliable fit and helping maintain consistent clearances

These tri-metal 77 engine bearings combine the strength of a copper-lead alloy layer with steel backing and electroplated babbitt metal, with the steel backing providing strength and durability while the babbitt overlay provides critical surface characteristics of slipperiness and conformability. The unique combination of design, metallurgy and engineering provides RACE Series performance bearings with the endurance and capability to perform where others cannot.

Application: Chevrolet Small Block and LS engines including Gen III and Gen IV 4.8L, 5.3L, 5.7L LS1/LS6, 6.0L LS2, and 6.2L LS3 applications. These bearings are particularly well-suited for racing engines, turbocharged applications, and builds running medium-to-high RPMs under demanding conditions.

Note: Engine bearings require proper tolerance measurement before purchase. The HXC designation indicates coated bearings with extra oil clearance for optimal performance with polished crankshaft journals.