King Engine Bearings MB1334XP0.25-5 XP-Series Performance Main Bearing Set 0.25mm Undersize

The King Engine Bearings MB1334XP0.25-5 is a high-performance main bearing set featuring King's advanced XP-Series technology designed for extreme racing applications. This 0.25mm undersize bearing set is engineered to deliver exceptional durability and reliability under the most demanding conditions.

Advanced XP-Series Construction:

• Enhanced tri-metal design with copper lead construction for superior load capacity
• pMax Black™ overlay - 24% harder than conventional tri-metal race bearings for improved fatigue resistance
• Nickel plate barrier layer provides exceptional stability between metal layers
• Lead/tin/copper Babbitt overlay over steel backing for maximum durability
• SecureBond adhesion process ensures superior layer stability

Precision Engineering:

• Bull's Eye Tolerance™ technology maintains wall thickness within ±0.0001 inches
• Narrowed design optimized for large radius crankshafts
• Enlarged, chamfered oil holes for improved lubrication
• Strategic grooving patterns enhance oil distribution
• 15-30% greater load capacity than traditional bearings

King XP-Series bearings are specifically developed for high-load, long-duration racing applications including circle track, road racing, marine, and other extreme performance builds requiring steel crankshafts. The 0.25mm undersize allows for proper bearing clearances on reground crankshafts during engine rebuilds.