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Return to Parts List Category : B- Small Block Dodge Magnum SEA 7050MA30 MAIN BEARING 3.9 MAGNUM $53.99  Aluminum Alloy, Chrysler Federal Mogul CP-Series rod bearings feature a classic tri-metal construction and are a good choice for either the street or moderate competition use. They have rugged 1010 steel backings, covered by Federal Mogul's H-24 copper-lead alloy. On top of this is a nickel barrier, followed by the tri-metal lead-tin-copper overplate that gives these bearings their strength and fatigue-resistance. The entire bearing is then covered with a flash coating of tin.