King Engine Bearings MB5293MC MC-Series Main Bearing Set for GM Vortec LS Gen III IV V

The King Engine Bearings MB5293MC is a high-performance main bearing set designed specifically for GM Vortec and LS-Series Gen III, IV, and V engines. This MC-Series bearing set features advanced nano-composite polymer coating technology that provides superior protection for modern start-stop and hybrid engine applications.

Advanced MC-Series Technology:

• Bi-metal construction with steel back and strengthened aluminum alloy
• K-340 nano-composite polymer coating for exceptional anti-friction and wear resistance
• Factory-applied coating adds no additional thickness to bearing
• Lead-free bearing material for environmental sustainability
• Ideal for engines with auto start-stop features that endure continuous metal-to-metal contact

Key Features:

• Set includes 5 bearing pairs for complete main journal coverage
• Standard size, 1/2 groove design
• Machined from bi-metal silicon aluminum
• OE-replacement bearing suitable for stock crankshafts
• Enhanced embeddability helps prevent foreign debris damage
• Improved oil clearance reduces wear and increases engine life

Application Notes:

• Designed for GM Vortec and LS-Series engines (Gen III, IV, and V)
• Compatible with factory crankshafts in stock replacement and mild performance applications
• Not recommended for use with aftermarket crankshafts
• No locating tabs on thrust or upper bearings for universal fitment across multiple applications

King Engine Bearings has been manufacturing precision engine bearings since 1960, utilizing proprietary Bull's Eye Tolerance™ technology that combines highly accurate machining with computerized wall thickness monitoring. The MC-Series coating provides additional startup protection and wear resistance, making these bearings an excellent choice for both standard engines and newer vehicles equipped with start-stop technology.