ACL Bearings 5M909HC-STD Race Series Main Bearing Set CT-1 Coated Small Block Chevy

The ACL Bearings 5M909HC-STD is a high-performance Race Series main bearing set designed for Chevrolet small block V8 engines including 262, 267, 302, 305, 307, 327, and 350 cubic inch applications. These coated bearings combine ACL's tough Race Series lining and overlay metallurgy with Calico's renowned CT-1 coating, providing exceptional protection and performance for demanding motorsport applications.

CT-1 Calico Coating Technology:

• Dry film lubricant coating that helps reduce friction and abrasive wear while providing intermittent dry lubrication unaffected by dust or dirt
• Protects against intermediate oil starvation during cold starts and rough terrain conditions
• Has shown reduction in oil temperatures as much as 15°F to 20°F
• Applied with typical coating thickness of 0.00025" to 0.00030" inch (6 to 7.5 microns)

Race Series Engineering Features:

• 3/4 grooved main bearings to optimize bearing load carrying surface area and oil flow to connecting rod bearings
• Hardened steel backs on all bearings to improve support of the bearing lining and assist with bearing retention in the housing
• Elimination of flash plating on the back of bearings to improve heat transfer and maximize grip between bearings and housing
• Manufactured to exacting tolerances with particular attention to wall thickness accuracy to ensure reliable fit and maintain consistent clearances
• Enlarged ID chamfers on bearing edges to accommodate large fillet radius on performance crankshafts

ACL Race Series performance engine bearings are recognized as a premier brand throughout the motorsports world, with rod and main bearings as standard components in race engines that have set records and won championships from Mexico to Bonneville. This standard size bearing set is ideal for high-RPM racing applications where reliability and durability are critical.