King Engine Bearings MB 524AM0.25 Main Bearing Set Mitsubishi 4G63 +0.25mm Oversize

The King Engine Bearings MB 524AM0.25 is an OE replacement crankshaft main bearing set designed for the Mitsubishi 4G63 engine. This set uses King's AM Series bi-metal aluminum construction, delivering reliable, factory-quality performance for passenger car engine rebuilds operating under low to medium load conditions.

The 0.25mm oversize designation makes this set suited for engines where the crankshaft journals have been machined undersize by 0.25mm, as is common during a proper engine rebuild or crankshaft restoration. The set includes 5 pairs of main bearing shells to fully replace all main bearings in the engine.

Key Features:

• AM Series Bi-Metal Construction: Aluminum-based bi-metal material — the softest and most conformable bearing material in King's lineup, ideal for OE replacement applications
• Lead-Free Formula: Environmentally responsible, lead-free aluminum alloy material that meets modern environmental standards without sacrificing performance
• 0.25mm Oversize: Designed for use with crankshafts that have been ground 0.25mm undersize during engine machining
• Complete Set: Includes 5 pairs (10 shells) to replace all crankshaft main bearings
• OE Replacement Grade: Built to meet or exceed original equipment specifications for reliable street and daily-driver use

The King AM Series bearing line has been a trusted choice for engine builders worldwide since King Engine Bearings was founded in 1960. These bearings are an excellent option for stock rebuilds and moderate-use applications on the Mitsubishi 4G63 platform.