XP Main Bearing Set

The XP Main Bearing Set by King Bearings is a critical internal engine component engineered for builders and enthusiasts pursuing high-performance modifications and reliable daily-driven builds. Whether you're rebuilding a tired engine, upgrading to forced induction, or restoring a classic platform, quality main bearings form the foundation of crankshaft stability and longevity. This set delivers the precision fit and material consistency required to support elevated boost pressures, increased RPM limits, and extended duty cycles without premature wear or catastrophic failure.

King Bearings' XP line employs advanced copper-lead alloy construction with optimized surface treatments to maximize oil film strength and load capacity across the full journal surface. The precision manufacturing tolerances ensure proper clearance for adequate lubricant circulation while maintaining tight enough contact to prevent harmful crankshaft deflection under load. Tri-metal construction provides superior fatigue resistance compared to softer vintage designs, making this set compatible with modern fuels, extended oil change intervals, and sustained high-load scenarios. The bearing geometry is calibrated for consistent performance across a wide thermal operating window.

Professional engine builders, performance shops, and experienced DIY mechanics choose this bearing set for naturally aspirated performance engines, turbocharged builds, and race applications requiring dependable bottom-end integrity. Installation requires proper measurement and alignment tools—verify your specific engine block and crankshaft specifications before ordering to confirm correct bearing clearance and fit. The compact weight of 1.35 lbs reflects the precision-machined material without excess, and the set's compact dimensions make handling and installation straightforward during a full block rebuild or refresh operation.