ACL Bearings 5M909HXC-STD Calico Coated Main Bearing Set Small Block Chevy

The ACL 5M909HXC-STD is a high-performance main bearing set designed for Small Block Chevrolet engines, including 267, 305, 327, and 350 cubic inch V8 applications. This Race Series bearing set features Calico Coatings CT-1 dry film lubricant coating for enhanced protection during critical startup and high-stress conditions.

Key Features:

• H-Series Race bearings developed for NASCAR and high-performance applications
• Calico CT-1 dry film lubricant coating reduces friction and abrasive wear
• Tri-metal construction with hardened steel backing for improved support and retention
• Extra clearance (HX designation) provides additional oil film thickness for high-RPM operation
• Standard size (STD) for use with standard journal crankshafts
• Enlarged chamfers accommodate large fillet radius performance crankshafts
• High crush factor ensures proper bearing retention in housing
• Medium eccentricity compensates for bore distortion at high RPM
• No flash plating on backing for improved heat transfer and seating

ACL Race Series bearings combine over 50 years of race bearing engineering expertise with advanced metallurgy to deliver the reliability and performance demanded by professional engine builders and racers. The Calico coating provides critical dry lubrication during engine startup and protects against metal-to-metal contact in extreme conditions. Ideal for engines operating at medium to high RPM ranges.