King Engine Bearings MB5304AM0.75 AM-Series Main Bearing Set Oversize - 0.75mm

The King Engine Bearings MB5304AM0.75 is an OE-replacement crankshaft main bearing set designed for Mazda B6, B6-T, ZM, B3, and B5 engines. This set is supplied in a 0.75mm oversize to accommodate reground crankshafts, and includes 5 pairs of bi-metal aluminum bearings.

King's AM-Series bearings utilize a standard aluminum-based bi-metal construction equivalent to SAE-783 — the softest bi-metal in King's range — making it well-suited for passenger car engines operating under low to medium loads. The lead-free aluminum compound is both environmentally safe and compliant with modern standards.

Key Features:

• AM-Series Bi-Metal Construction — Standard aluminum-based material, SAE-783 equivalent, optimized for low to medium load applications
• 0.75mm Oversize — Designed for use with reground or undersized crankshafts
• Lead-Free Material — Environmentally safe composite with no lead content
• Bull's Eye Tolerance™ Technology — King's proprietary manufacturing process combining precision machining, overplating, and computerized wall thickness monitoring for consistent, accurate bearing dimensions
• OE Replacement Quality — Engineered to meet or exceed original equipment specifications

King Engine Bearings has specialized in engine bearings since 1960, producing high-quality components for automotive, marine, aviation, and racing applications. Every bearing undergoes rigorous quality control checkpoints throughout the manufacturing process to ensure precision and reliability.