King Engine Bearings MB5283HP0.25 HP-Series Main Bearing Set Ford DOHC/SOHC - V8 4.6L 24V 0.25mm

The King Engine Bearings MB5283HP0.25 is an HP-Series performance main bearing set designed for the Ford V8 4.6L DOHC/SOHC 24-valve engine. This set is offered in a 0.25mm undersize, corresponding to a crankshaft ground 0.010" undersize, making it ideal for engine rebuilds requiring crankshaft regrinding.

King's HP Series is built around their proprietary Alecular bi-metal aluminum silicon alloy construction — a race-developed material engineered to outperform conventional Babbitt-overlay bearings under demanding conditions. The Alecular composite delivers superior resistance to extrusion and material migration, making it especially well-suited for high-load, short-duration applications such as drag racing, monster truck, and tractor pull competition. It also serves performance street and strip builds using nodular cast iron crankshafts.

Key Features:

• Alecular bi-metal construction — aluminum silicon alloy provides a harder top layer than Babbitt to resist extrusion and journal damage
• Load capacity of 8,000 PSI — engineered for high-stress performance applications
• 0.25mm undersize — fits crankshafts ground 0.010" undersize during reconditioning
• 5 pairs included — complete main bearing set for all five main journals
• Greater eccentricity — promotes superior oil distribution and film maintenance at high RPM
• Chamfered oil holes — supports improved oiling to protect journals under race conditions
• Chamfered surface — accommodates large-radius crankshaft fillets common on performance and aftermarket cranks
• Suitable for blown, turbocharged, nitrous, and alcohol-fueled engine builds
• Also applicable for street/strip and circle track engines using nodular cast iron crankshafts

King Engine Bearings has specialized exclusively in engine bearings since 1960, supplying the motorsport, aviation, marine, and performance automotive industries. Every HP-Series bearing is manufactured to precise tolerances and subjected to rigorous quality control to ensure consistent fitment and long-term reliability in demanding applications.