King Engine Bearings MB7008XP XP Series Tri-Metal Main Bearing Set Nissan - RB25DET 24V

The King Engine Bearings MB7008XP is a complete main bearing set engineered for the Nissan RB25DET 24-valve engine. Part of King Racing's flagship XP Series, these bearings are purpose-built for high-performance and motorsport applications that demand superior load capacity, precision tolerances, and long-term durability under extreme operating conditions.

The XP Series was developed specifically for performance builds using forged steel aftermarket crankshafts subjected to high loads over extended periods. The foundation of the XP Series is pMax Black, a proprietary tri-metal structure that is 24% harder than conventional tri-metal race bearings. This enhanced copper-lead construction includes a nickel barrier and King's SecureBond adhesion process, which locks the top and intermediate layers together for superior structural stability.

Key Features:

• pMax Black Tri-Metal Construction: Enhanced copper-lead bearing material with nickel barrier for exceptional hardness and fatigue resistance
• 15%–30% Greater Load Capacity compared to traditional performance bearings
• Bull's Eye Tolerance: Industry-leading wall tolerances with all shells matched to within 0.0001"
• SecureBond Adhesion: Proprietary bonding process ensures superior stability between bearing layers
• 0.0005" Performance Overlay: Metallurgically enhanced and hardened overlay resists surface fatigue under extreme loads
• Improved Oiling: Enlarged, chamfered oil holes in main bearings for optimized lubrication flow
• Medium Eccentricity: Optimizes load distribution and enhances oiling across the bearing surface
• Half-Groove Mains: Upper shell grooved, lower shell ungrooved to maximize load capacity
• Narrowed Design: Compatible with large-radius crankshafts used in performance builds
• Increased Bearing Height: Improves bearing-to-bore contact and heat transfer while reducing spin risk at high RPM

Ideal Applications:

• High-load, long-duration racing including circle track, off-road, and offshore motorsport
• Turbocharged and high-boost street performance builds
• Applications using forged steel aftermarket crankshafts

King Engine Bearings offers the industry's widest selection of bearing sizes and clearance options. The MB7008XP is available in standard sizing as well as special clearance variants to suit the specific requirements of your RB25DET build.