ACL Bearings 8B663HC-001 H-Series Connecting Rod Bearings, 0.001 in Undersize, Coated, Small Block Chevy and GM LS-Series

ACL Bearings 8B663HC-001 H-Series connecting rod bearings are designed for performance-focused Small Block Chevy and GM LS-Series engine builds. This bearing set features a 0.001-inch undersize specification for crankshafts that have been precisely machined to accept undersize bearings. The coated surface supports reduced friction, dependable oil retention, and consistent operation under demanding engine conditions.
The H-Series design is intended for high-performance applications where bearing stability and load control are essential. ACL Bearings manufactures these rod bearings with materials and construction suited to performance street, competition, and modified engine environments. Their application coverage includes popular Small Block Chevy 305–400 cubic-inch engines and compatible GM LS-Series configurations, helping provide a reliable fit when rebuilding or upgrading the bottom end.
This kit is a practical choice for engine builders and technicians seeking replacement connecting rod bearings with a performance-oriented design. Always verify crankshaft journal measurements, bearing clearance, engine configuration, and manufacturer specifications before installation. Proper inspection and assembly procedures are essential for achieving the expected service life and performance from the ACL Bearings 8B663HC-001 set.

Features:

• Brand: ACL Bearings

• Part Number: 8B663HC-001

• Bearing Type: H-Series connecting rod bearing set

• Fitment: Small Block Chevy and GM LS-Series engines

• Engine Range: Chevrolet 305–400 cubic-inch applications

• Size: 0.001-inch undersize

• Surface: Performance-oriented coated bearing construction

• Application: Performance street, competition, and modified engine builds