XP-Series Main Bearings

The King Racing XP-Series Main Bearings (MB5013XP 010) are high-performance engine components engineered for race applications. Constructed with an advanced tri-metal composition, these bearings feature a layered copper-lead construction with a nickel plate barrier and a lead/tin/copper Babbitt overlay on a steel backing. This design ensures superior stability and durability under extreme conditions. These XP-Series bearings are specifically designed for race use, offering enhanced features such as narrowed dimensions for large radii crankshafts, enlarged and chamfered oil holes, and grooving options (full, 3/4 in., or 1/2 in.) for improved oiling. King Racing's meticulous control processes maintain exceptionally tight wall thickness tolerances, within +/- 0.0001 inches, to ensure consistent performance and reduce friction. The race-only Xtreme Performance (XP-Series) Tri-Lecular main bearings are built to withstand the significant power output of race engines. This specific part number, MB5013XP 010, is for crankshafts that are 0.010 inches (0.25mm) undersize. The bearings are sold as a set and are compatible with a wide range of GM LS-series engines, including various Chevrolet, GMC, Cadillac, Buick, Pontiac, Hummer, Isuzu, and Workhorse applications from approximately 2001 to 2017, covering engines such as the 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L. The exact fitment details should always be confirmed with the vehicle's specific year, model, engine size, and VIN code.