King Engine Bearings MB 770AM1.5 AM-Series Main Bearing Set +1.5mm Oversize

The King Engine Bearings MB 770AM1.5 is a complete crankshaft main bearing set for the BMW M30 engine family, supplied in a +1.5mm oversize dimension to accommodate reground crankshafts. Part of King's AM-Series lineup, this set is engineered with bi-metal aluminum construction to deliver reliable, long-lasting performance during engine rebuilds.

Material & Construction:

• Bi-Metal Aluminum (AM-Series / K-783): Standard aluminum-based material equivalent to SAE-783, designed for low and medium load engines
• Superior embeddability helps protect crankshaft journals by allowing micro-particles to embed harmlessly into the bearing surface
• Steel-backed construction provides precise dimensional stability and secure housing fit

Key Features:

• Complete main bearing set — includes all required bearing pairs for a full crankshaft replacement
• +1.5mm oversize — intended for use when crankshaft journals have been reground 1.5mm under standard dimensions
• OE-replacement quality fit and finish for accurate oil clearances
• Recommended for street and marine rebuild applications
• Manufactured to tight tolerances under one roof for consistent quality control

Compatible Engine Families:

• BMW M30B25
• BMW M30B28
• BMW M30B32
• BMW M30B33
• BMW M30B35

King Engine Bearings has been a specialist bearing manufacturer since 1960, producing a comprehensive range of bearings for automotive, marine, aviation, and industrial applications. The AM-Series main bearing set is an ideal choice for engine rebuilders seeking a proven, cost-effective OE-replacement solution for the BMW M30 inline-six engine platform.