King Engine Bearings MB5672XPSTDX XP Series Tri-Metal Main Bearing Set STD

The King Engine Bearings MB5672XPSTDX is a XP Series high-performance main bearing set designed for the Ford Escort/Sierra YB 2.0L DOHC Cosworth engine. Built for demanding race and high-performance applications, this set features King's advanced pMax Black tri-metal construction — engineered to handle extreme loads, sustained high RPM, and the rigors of forged steel aftermarket crankshafts.

The XP Series represents King Racing's most advanced bearing technology, combining enhanced metallurgical engineering with precision geometric design. pMax Black is a unique tri-metal structure that is 24% harder than conventional tri-metal race bearings, delivering superior fatigue resistance and load capacity over extended performance use.

XP Series Construction:

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

Precision Engineering Features:

• Bull's Eye Tolerance: Wall tolerances held to 0.0001", with all shells matched for consistent fitment
• Enlarged, Chamfered Oil Holes: Mains feature improved oiling passages for better lubrication under load
• Medium Eccentricity: Optimizes load distribution and oil film retention
• Narrowed Design: Compatible with large-radius crankshafts — mains and rods narrowed accordingly
• Increased Bearing Height: Improves bearing-to-bore contact, heat transfer, and reduces spin potential at high RPM

Ideal Applications:

• High-load, long-duration racing including circle track, off-road, and offshore
• Performance builds using forged steel aftermarket crankshafts
• Any application demanding sustained extreme cylinder pressure and RPM

King Engine Bearings are manufactured to the tightest tolerances in the industry, offering one of the widest selections of sizes and clearance options available. The MB5672XPSTDX is supplied in standard (STD) sizing for a precision, race-ready fit right out of the box.