King Engine Bearings MB5116SI030 Main Bearing Set Undersize - 030

The King Engine Bearings MB5116SI030 is a precision-engineered main bearing set designed for Mopar 426 HEMI and 440 cubic inch RB-Series V8 engines. This SI-Series bearing set features a .030 inch undersize specification for crankshafts that have been machined undersize, making it ideal for engine rebuilds and performance applications.

SI-Series Technology:

King's SI-Series bearings represent an advanced bi-metal bearing design featuring a unique aluminum alloy enhanced with tin and 3% silicone. This silicone-strengthened formulation provides superior durability and performance for medium-load OE replacement and performance engine applications. The SI-Series improves upon conventional bi-metal bearings while offering a cost-effective alternative to traditional tri-metal options.

Key Features:

• Bearing undersize: .030 inch for machined crankshafts
• Bearing widths: 0.902 inch and 1.230 inch
• Standard bearing thickness (without undersize): 0.096 inch
• Captured thrust bearing style for precise axial control
• Sold as a complete set (5 bearings per package)
• Improved oil clearance reduces wear and increases engine life
• Reduces operating noise, vibration, and excess oil flow
• Bulls Eye tolerance with shells matched to 0.0001 inch

Application-Specific Engineering:

Unlike generic bearing manufacturers, King tailors each bearing solution to match the specific demands of the engine application. Every SI-Series bearing is designed with precision fitment and optimized performance characteristics for Mopar big-block engines. King's stringent quality control processes ensure each bearing meets exacting tolerances, with individual shells stamped with production numbers for complete traceability.

King Engine Bearings has specialized exclusively in engine bearings since 1960, manufacturing bearings for automotive, marine, aviation, and racing applications. Their ISO 9001:2000, TS 16949, and AS 9100 certifications demonstrate their commitment to producing the highest quality bearings available in the aftermarket.