ACL Bearings 1B743HX-STD Race Series Rod Bearing Set Big Block Chevy - 396-454

The ACL Bearings 1B743HX-STD is a high-performance Race Series connecting rod bearing set designed for Chevrolet Big Block V8 engines including 396, 402, 427, and 454 cubic inch applications. These premium bearings are engineered to withstand extreme racing conditions with high RPM operation and demanding loads.

Race Series Performance Features:

• High strength overlay plate with reduced thickness for improved fatigue properties under extreme stress
• Hardened steel backing on all rod bearings to improve support of the bearing lining and assist with retention in the housing
• Elimination of flash plating on bearing backs to improve heat transfer and maximize grip between bearings and housing
• Increased eccentricity to compensate for bore distortion at high RPM and assist in formation of hydrodynamic oil films
• Tight consistent wall tolerances to help maintain precise clearances
• Enlarged ID chamfers on bearing edges to accommodate large fillet radius on performance crankshafts

The HX designation indicates extra oil clearance of approximately 0.001 inch compared to standard H-series bearings, making this set ideal for high-performance builds requiring increased bearing clearances. Standard size (STD) for use with standard crankshaft journals. ACL Race Series bearings are trusted by professional engine builders and racers worldwide for their exceptional durability and performance in the most demanding motorsports applications.