ACL Trimetal Reinforced Main Bearings - Mazda B1, B3, B5, Z5-DEACL Race Main Bearings Mazda B1 B3 B5 Z5 DEDesigned to withstand high RPM temperatures and load these high strength bearings are manufactured by ACL from 3 layers of hardened steel copper and nickel. This "trimetal" composition substantially lowers friction and thus reduces the operating temperatures while providing superior lubrication. These bearings are sold in complete sets (for a complete engine). If you require non standard grade bearings or HX
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