King Engine Bearings MB529SI001 Main Bearing Set Ford Bimetal - V8 221

The King Engine Bearings MB529SI001 is a complete main bearing set engineered for the Ford V8 221 cubic inch engine. Manufactured from a bimetal aluminum-silicon (SI) alloy, these bearings deliver excellent conformability, superior load capacity, and strong corrosion resistance — making them a reliable choice for both engine rebuilds and performance applications.

Key Features:

• Bimetal aluminum-silicon construction for enhanced wear resistance and durability
• High-grade steel backing provides structural rigidity and precise fitment
• Excellent fatigue strength to handle the stresses of high-load engine operation
• Superior corrosion and cavitation resistance for extended service life
• Precision-machined to OEM tolerances for accurate oil clearances
• Full main bearing set — includes all bearings required to replace the crankshaft main journals
• Designed for use in Ford V8 221 engine applications

King Engine Bearings is a globally recognized manufacturer known for producing high-precision engine bearings used in OEM and aftermarket engine rebuilds. The SI (silicon-aluminum) material designation indicates a premium bimetal formulation that outperforms standard copper-lead bearings in many modern and classic applications. The MB529SI001 is a drop-in replacement solution that meets or exceeds original equipment specifications.