Main Bearing Set GM LS1/LS2/LS4/LS6 MB5013XP 020

Main bearing wear is one of the fastest paths to catastrophic engine failure—and stock bearings often aren't built for high-RPM racing demands. The MB5013XP 020 XP series bearings deliver the precision tolerances and load-carrying capacity your LS engine needs to survive sustained boost, nitrous, or aggressive naturally-aspirated builds. Whether you're rebuilding after a failure or fortifying an engine for competition, these bearings are engineered to keep your crank centered and protected.

This is a complete main bearing set designed specifically for GM LS-series engines (LS1, LS2, LS4, LS6), meaning all journals are covered in one kit. The 0.020-inch undersize specification accommodates crank grinding, allowing you to reclaim worn journals and restore factory geometry without full crank replacement. XP material science provides superior oil film strength and fatigue resistance compared to standard OEM bearings—critical when running elevated boost or extended high-load conditions.

• GM LS-series engines
• Complete main bearing kit
• 0.020 in undersize
• XP performance material
• Precision CNC manufactured
• Superior oil film strength
• High load capacity
• MPN: MB5013XP 020
• Bolt-in installation