King Engine Bearings MB5293SI 040 Main Bearing Set GM LS Vortec Gen III IV - 040

The King Engine Bearings MB5293SI 040 is a high-performance main bearing set engineered specifically for GM Vortec and LS-Series Gen III and Gen IV engines. This precision-manufactured bearing set features advanced bimetal construction with an aluminum-silicon alloy base material, providing exceptional strength, heat dissipation, and wear resistance for demanding performance and racing applications.

Key Features:

• Bimetal construction with aluminum-silicon base for superior durability
• 0.040" oversize for engines with machined crankshafts
• Precision-engineered for GM LS1, LS2, LS3, LS6, LS7, LQ4, LQ9, and related Gen III/IV engines
• Enhanced oil clearance design for improved lubrication flow
• Meets or exceeds OEM specifications for dimensional accuracy
• Ideal for performance rebuilds, stroker builds, and high-horsepower applications

King Engine Bearings are manufactured to exacting tolerances using state-of-the-art materials and processes, ensuring reliable performance under extreme conditions. The aluminum-silicon bimetal composition provides excellent conformability and embeddability while maintaining dimensional stability across a wide temperature range. This bearing set is a direct replacement for worn or damaged main bearings in GM LS-series engines and is compatible with both stock and performance crankshafts that have been machined 0.040" undersize on the main journals.