King Engine Bearings MB5673XPSTDX XP Series Tri-Metal Main Bearing Set STD

The King Engine Bearings MB5673XPSTDX is a XP Series high-performance main bearing set designed for Honda F20C and F22C 16-valve engines. Built for demanding motorsport applications, these bearings feature King's proprietary pMax Black tri-metal construction — engineered to handle extreme loads over extended high-RPM operation, making them an ideal choice for performance builds using forged steel aftermarket crankshafts.

XP Series Technology:

• pMax Black Overlay: Unique tri-metal structure that is 24% harder than conventional tri-metal race bearings, delivering superior surface fatigue resistance
• Enhanced Tri-Metal Construction: Copper-lead base with nickel barrier and SecureBond adhesion process for superior stability between the top and intermediate layers
• 0.0005" Hardened Performance Overlay: Metallurgically enhanced overlay withstands greater loads and resists surface fatigue under race conditions
• 15%–30% Greater Load Capacity: Outperforms traditional bearings in high-load, long-duration racing environments
• Half-Grooved Mains: Upper shells are 1/2 grooved to maintain uncompromised load capacity in the lower shell

Precision Engineering Features:

• Bull's Eye Tolerance: Industry-leading wall tolerances with all shells matched to 0.0001" for optimal fitment
• Enlarged, Chamfered Oil Holes: Improved oiling passages on main bearings for consistent lubrication under load
• Medium Eccentricity: Optimizes load distribution and promotes better oil film retention
• Narrowed Design: Compatible with large-radius crankshafts common in performance applications
• Increased Bearing Height: Improves bearing-to-bore contact and heat transfer while reducing spin potential at high RPM

Ideal Applications:

• High-load, long-duration racing including circle track, off-road, and offshore competition
• Performance street and track builds using forged steel aftermarket crankshafts
• Honda F20C and F22C 16-valve engine builds requiring precision main bearing replacement

King Engine Bearings are engineered to withstand the highest loads and RPM levels produced by today's top competition engines. The XP Series represents the pinnacle of King's bearing technology, combining advanced metallurgy and precision geometry into a complete main bearing set.