King Engine Bearings MB5280SI0.75 Main Bearing Set 0.75mm Undersize Ford 4.6L 281

The King Engine Bearings MB5280SI0.75 is a precision-engineered main bearing set designed for Ford 4.6L V8 engines (281 cubic inch displacement). This set features a 0.75mm (0.030") crankshaft undersize specification, making it ideal for engines with machined crankshafts that require undersize bearings for proper clearance.

Advanced SI Bi-Metal Construction:

King's bi-metal SI material blends aluminum with 2.5-3% silicon, providing exceptional strength. This material is ideal for medium-load engines, particularly those using nodular cast iron crankshafts, and excels as a lead-free OE replacement bearing. The aluminum-silicon composition offers excellent conformability, embedability, and resistance to fatigue while meeting modern environmental standards.

Complete Set Includes:

• 5 pairs of main bearings (10 bearing shells total)
• Upper and lower bearing shells for all five main journals
• Half-groove design for optimal oil distribution
• King Bull's Eye Tolerance™ Technology for precise dimensional control

Key Features:

• Lead-free construction for environmental compliance
• Optimized for Ford Modular V8 engines (4.6L/281 CI)
• Precision-machined to exacting tolerances
• Excellent load capacity for street and performance applications
• Compatible with nodular cast iron crankshafts

King Engine Bearings has been a trusted name in engine bearings since 1960, specializing in high-quality bearing solutions for automotive, marine, and performance applications. Each bearing is manufactured using advanced materials and engineering to ensure reliable performance and long service life.