ACL Coated Race Series Main Bearings to suit Nissan RB30ACL Main Bearing Set Nissan RB30 7M2428HXC STD or 7M2428HC STD Our coated bearings combine ACLs tough RACE Series lining and overlay metallurgy with Calicos well renowned CT 1 coating. CT 1 is a Dry Film Lubricant coating that helps reduce friction and abrasive wear. It provides intermittent dry lubrication and is not affected by dust or dirt. CT 1 is specifically engineered to withstand the extreme conditions of todays high performance engines.