King Engine Bearings MB7720AM0.5 Bimetal Main Bearing Set +0.50mm Oversize

The King Engine Bearings MB7720AM0.5 is a complete OE-replacement main bearing set designed for BMW inline-six engines. This set includes 7 pairs of bi-metal main bearings in a +0.50mm oversize dimension, making it the correct choice for engines with crankshafts that have been machined 0.50mm undersize during a rebuild.

Constructed using King's AM-Series bi-metal aluminum material, these bearings feature a steel back bonded with an aluminum-tin lining alloy (Al20Sn1Cu), equivalent to the industry-standard SAE-783 specification. This material composition delivers excellent conformability and embedability, making it well-suited for passenger car engines operating under low to medium loads. The bearings also feature a 180-degree oil hole for proper lubrication distribution.

Key Features:

• AM-Series bi-metal construction — steel back with aluminum-based lining
• Equivalent to SAE-783 aluminum alloy specification
• +0.50mm oversize to match reground crankshaft journals
• 180-degree oil hole for optimal oil flow and lubrication
• Lead-free, environmentally safe composite material
• OE-replacement grade — ideal for street and standard-load applications
• Manufactured to King's Bull's Eye Tolerance™ precision standards

King Engine Bearings has been an industry leader in precision engine bearings since 1960. The AM-Series is the recommended choice for OE-equivalent replacement in naturally aspirated passenger car engines. Available in multiple oversize options to accommodate various crankshaft regrind specifications.