King Engine Bearings MB1333XP0.25-3 XP-Series Main Bearing Set Undersize - 0.25mm

The King Engine Bearings MB1333XP0.25-3 is a 0.25mm undersize XP-Series performance main bearing set designed for high-performance and racing engine applications. This set is engineered for engines requiring a first undersized regrind, restoring precise crankshaft clearances during engine rebuilds or overhauls.

King's XP-Series main bearings are built with advanced bi-metal construction, combining a high-strength steel backing with a specially formulated aluminum alloy overlay. This design delivers superior load capacity, fatigue resistance, and oil film retention compared to standard OE-replacement bearings — making them the preferred choice for performance street and competition builds.

Key Features:

• XP-Series performance construction — bi-metal design with high-strength steel backing and aluminum alloy overlay
• 0.25mm undersize — engineered for crankshafts reground to first undersize specification
• Enhanced eccentricity profile for improved oil film distribution and reduced bearing wear
• Tight manufacturing tolerances for precise fitment and consistent oil clearance
• Suitable for high-performance street, track, and competition engine applications
• Manufactured to King's strict quality standards used by professional engine builders worldwide

King Engine Bearings has specialized exclusively in engine bearings since 1960, supplying the automotive, racing, marine, and aviation industries with precision components trusted by professional builders. The MB1333XP0.25-3 main bearing set is an ideal solution for any performance engine rebuild requiring 0.25mm undersize main bearings.