ACL Bearings 8B663HXN-STD Race Series Connecting Rod Bearing Set Small Block Chevy LS

The ACL Bearings 8B663HXN-STD is a high-performance connecting rod bearing set engineered for Chevrolet small block and LS engine applications. This Race Series bearing set features narrowed shells designed specifically for aftermarket crankshafts with extra-large fillet radii, combined with 0.001-inch extra oil clearance for optimal performance under demanding conditions.

Key Features:

• Tri-metal construction with high-strength overlay plate for superior durability
• Narrowed bearing shells with maximum width of 0.791 inches (20.1mm) for large fillet radius clearance
• HX design provides 0.001-inch (0.025mm) additional oil clearance compared to standard H-series
• Enlarged chamfers on bearing edges accommodate performance crankshaft fillet radii
• Precision-manufactured with tight wall thickness tolerances for consistent clearances
• Reduced overlay thickness improves fatigue resistance under high RPM conditions
• Standard size bearing suitable for 2.099-inch minimum crankshaft journals

Applications:

Compatible with Chevrolet 4.8L, 5.3L, 5.7L (LS1, LS6), 6.0L (LS2, LFA), and 6.2L (LS3, L99) Gen III and Gen IV engines, as well as small block Chevy 262, 265, 267, 305, 307, 327, and 350ci V8 engines with large pin connecting rods.

ACL Race Series bearings are proven in professional motorsports from NASCAR to NHRA competition, delivering the endurance and performance required for high-RPM, high-boost applications where standard bearings cannot survive.