King Engine Bearings XP-Series Performance Main Bearing Undersize

King Engine Bearings XP-Series performance main bearings (crankshaft main bearings) are built for engines that see high loads and sustained stress. The XP-Series is King's Xtreme Performance line, aimed at circle track, road racing, endurance and other high-load applications. These undersize bearings are made for crankshafts that have been machined below standard journal size. An undersize bearing is a thicker bearing that restores proper oil clearance on a ground crankshaft.

Key Features:

• Tri-metal construction: a copper-lead layer with a nickel barrier and a lead/tin/copper overlay, over a steel backing.
• Bonded layers: the layers are joined to the steel backing by an adhesion process that adds stability and durability.
• High load capacity: King describes the XP-Series as offering consistent, reliable performance under heavy load.
• Tight tolerances: King states wall thickness is held to within +/- 0.0001 in. for consistent clearances.
• Improved oiling: enlarged, chamfered oil holes with full, 3/4 or 1/2 grooving, depending on the application.
• Narrowed design: clears the large-radius crankshafts common in performance builds.

King Engine Bearings has built nothing but engine bearings since 1960. Choose the undersize that matches your crankshaft journal measurements after machining.