King Engine Bearings MB4058XP025 XP Series Main Bearing Set Nissan - for VQ35DE

The King Engine Bearings MB4058XP025 is a high-performance main bearing set designed specifically for the Nissan VQ35DE 24-valve engine. This .25mm oversize bearing set features King Racing's advanced XP Series construction, engineered to withstand extreme loads and extended racing conditions with forged steel aftermarket crankshafts.

pMax Black Tri-Metal Technology:

The XP Series features pMax Black construction, a unique tri-metal structure that is 24% harder than conventional tri-metal race bearings. This enhanced copper-lead tri-metal construction includes a nickel barrier layer and SecureBond adhesion process for superior stability between layers. The metallurgically enhanced 0.0005-inch performance overlay resists surface fatigue and delivers 15-30% greater load capacity than traditional bearings.

Performance Features:

• Bulls Eye Tolerance: Industry-leading wall tolerances with all shells matched to 0.0001 inch for consistent performance
• Half-Grooved Design: Mains feature 1/2 groove configuration for uncompromised lower shell load capacity
• Enhanced Oiling: Enlarged, chamfered oil holes improve lubrication under high-RPM conditions
• Medium Eccentricity: Optimizes load distribution and oil flow for improved bearing life
• Narrowed Profile: Designed to accommodate large-radius crankshafts
• SecureBond Adhesion: Proprietary bonding process ensures superior layer-to-layer stability under extreme conditions

Ideal Applications:

This bearing set is engineered for high-load, long-duration racing applications including circle track, off-road, drag racing, and street performance builds using steel crankshafts. The XP Series meets the demands of competition engines that operate at extreme RPM and cylinder pressures for extended periods.

Size Specification:

This set is 0.25mm (.010 inch) oversize, designed for engines with main journals machined oversize for rebuilding or performance applications.