King Engine Bearings MB 427AM0.75 Main Bearing Set Chevrolet 173 V6 +0.75mm Oversize

The King Engine Bearings MB 427AM0.75 is an OE-replacement crankshaft main bearing set designed for the Chevrolet 173 V6 engine. This set is manufactured to a +0.75mm oversize specification, making it the correct choice for engines with reground or worn crankshaft journals that require an oversized bearing for proper oil clearance.

This bearing set is part of King's AM Series — their standard bi-metal OE-replacement line engineered for passenger car engines operating under low to medium loads. The bearings are constructed from King's Alecular Alloy (AM), a proprietary blend of aluminum, tin, and copper applied over a high-strength steel backing, delivering reliable durability and conformability for everyday street use.

Key Features:

• +0.75mm oversize for use with reground crankshaft journals
• Bi-metal construction — Alecular Alloy (AM) on high-strength steel backing
• Superior embeddability to absorb micro-particles and reduce crank journal scratching
• Precision tolerance control to within ±.0001 inch for consistent oil clearance
• Lead-free formulation — environmentally friendly and user-safe
• Recommended for street and marine applications
• Includes 4 pairs (full main bearing set)
• Manufactured to TS16949 automotive and AS9100 aerospace quality standards

King Engine Bearings has been a trusted name in precision engine bearings since 1960, supplying both OEM and performance engine builders worldwide. The MB 427AM0.75 delivers factory-quality fit and reliable performance for engine rebuilds on the Chevrolet 173 V6 platform.