King Engine Bearings MB7721AM Main Bearing Set Mercedes-Benz - M103 M104 OM603

The King Engine Bearings MB7721AM is a precision-engineered main bearing set designed specifically for Mercedes-Benz M103, M104, and OM603 engines. This complete set includes 7 pairs of bearings manufactured to OE-replacement specifications, providing reliable performance for passenger car engines with low to medium loads.

Key Features:

• Part of King's AM Series - premium OE-replacement quality
• Bi-metal construction featuring aluminum-based bearing material
• Lead-free bearing material for environmental sustainability and safety
• Complete set includes 7 pairs of main bearings
• Standard size (STD) crankshaft bearings
• Manufactured with King's proprietary high-speed production technology
• Rigorous quality control checkpoints throughout production

King Engine Bearings employs the softest bi-metal in their range for this application, making it ideally suited for street-driven Mercedes-Benz engines. The aluminum-based bearing material provides excellent conformability and embeddability, essential characteristics for reliable operation in stock and mild performance builds. The lead-free formulation demonstrates King's commitment to environmental responsibility without compromising bearing performance or longevity.

OEM Cross-References: Mercedes-Benz 603 030 0540, 603 030 1040; GLYCO H997/7 STD; KOLBENSCHMIDT 87416600