King Engine Bearings MB4104XP10 XP Series Main Bearing Set Tri-Metal +1.0mm

The King Engine Bearings MB4104XP10 is a high-performance main bearing set from the renowned XP Series, engineered specifically for Nissan VG30DE and VG30DETT engines. Designed for extreme performance applications using forged steel aftermarket crankshafts, this set delivers the strength and precision demanded by serious racing and high-output street builds.

The XP Series leverages advanced metallurgical and geometric technologies to handle extreme loads over extended durations. The proprietary pMax Black tri-metal structure is 24% harder than conventional tri-metal race bearings, providing superior resistance to surface fatigue, wear, and deformation under sustained high-RPM and high-load conditions.

XP Series Construction:

• Enhanced tri-metal copper-lead construction with nickel barrier layer
• SecureBond adhesion process ensures superior stability between the top and intermediate layers
• 0.0005" metallurgically hardened performance overlay for greater load resistance and fatigue protection
• Mains are half-grooved to preserve full lower shell load capacity
• 15%–30% greater load capacity than traditional performance bearings

King XP Series Features:

• Bull's Eye Tolerance: Industry-leading wall tolerances with all shells matched to 0.0001"
• Increased Bearing Height: Improves bearing-to-bore contact, enhances heat transfer, and reduces spin potential at high RPM
• Improved Oiling: Enlarged, chamfered oil holes for optimized lubrication flow
• Medium Eccentricity: Enables optimum load distribution and improved oil film retention
• Narrowed Design: Accommodates large-radius crankshafts for maximum compatibility with performance builds
• Dowel Holes: Available with or without dowel holes to suit various engine configurations

Ideal Applications:

• High-load, long-duration racing including circle track, off-road, offshore, and endurance formats
• Performance street engines running forged steel crankshafts
• Builds requiring extended oversize clearance — this set is sized at +1.0mm

King Engine Bearings are manufactured to the closest wall tolerances in the industry and offer the widest selection of sizes and clearance options. The MB4104XP10 is the right choice when your build demands uncompromising precision and maximum bearing durability.