King Engine Bearings MB 461AM0.25 Main Bearing Set +0.25mm Undersize

The King Engine Bearings MB 461AM0.25 is an AM-Series crankshaft main bearing set in a +0.25mm undersize specification, engineered for engine rebuilding and overhaul applications. Built on King's industry-leading bi-metal aluminum-silicon construction, this set delivers reliable performance for low-to-medium load engines with street and marine duty cycles.

King AM-Series (K-783) Features:

• 100% lead-free aluminum-silicon alloy — environmentally responsible and user-safe
• Superior embeddability — captures micro-contaminants to protect crankshaft journals from scratching and wear
• Bull's Eye Tolerance™ Technology — precision wall thickness control to ±0.0001" for consistent, accurate oil clearances
• +0.25mm undersize — designed for use with crankshafts that have been ground 0.25mm undersize during engine reconditioning
• Steel-backed construction for structural rigidity and reliable seating in the bearing bore
• Complete main bearing set — includes all main bearings required for a full engine installation

King Engine Bearings has specialized exclusively in engine bearings since 1960, applying knowledge gained from aviation and motorsport applications to every bearing they produce. The AM-Series is the ideal choice for street engine rebuilds where a dependable, high-quality OE-style replacement is required.