King Engine Bearings MB5304XPSTDX XP Series Main Bearing Set for Mazda B6 B6-T ZM B3 B5

The King Engine Bearings MB5304XPSTDX is a high-performance main bearing set engineered for Mazda B6, B6-T, ZM, B3, and B5 engines. Part of King's XP Series, these bearings feature advanced tri-metal construction designed to withstand extreme loads in demanding racing applications.

XP Series Technology:

The XP Series incorporates pMax Black tri-metal technology, which is 24% harder than conventional tri-metal race bearings. This enhanced material structure provides 15% to 30% greater load capacity than traditional bearings, making it ideal for forged steel aftermarket crankshafts and high-load racing conditions including circle track, off-road, and endurance racing.

Key Features:

• Enhanced Tri-Metal Construction: Copper-lead alloy with nickel barrier and SecureBond adhesion technology for superior layer stability
• Hardened Performance Overlay: 0.0005" metallurgically enhanced overlay resists surface fatigue and withstands greater loads
• Bulls Eye Tolerance: Industry-leading wall tolerances with all shells matched to 0.0001" for precise fitment
• Half-Grooved Main Design: Upper shells are grooved while lower shells remain ungrooved for maximum load capacity
• Optimized Geometry: Medium eccentricity design enables optimal load distribution and improved oil flow
• Enhanced Oiling: Enlarged, chamfered oil holes improve lubrication delivery
• Narrowed Profile: Designed to accommodate large-radius crankshafts

Applications:

Specifically developed for high-load, long-duration racing applications including circle track, off-road, offshore marine racing, and other motorsports that utilize forged steel crankshafts and generate sustained high loads at elevated RPM.

This standard size bearing set provides the durability and performance demanded by professional engine builders and serious racers pushing the limits of engine performance.