King Engine Bearings MB 529HP 020X HP-Series Main Bearing Set Ford 260 289 302 5.0L Windsor .020X

The King Engine Bearings MB 529HP 020X is a complete HP-Series main bearing set engineered for Ford 260ci, 289ci, 302ci, and 5.0L Windsor small block engines. This set is sized at .020X, meaning it is designed for crankshafts ground .020" undersize with an additional .001" extra oil clearance for high-performance applications.

King HP-Series Alecular Bi-Metal Technology:

• Alecular bi-metal construction — a proprietary lead-free aluminum silicon alloy composite engineered to resist extrusion and material migration under extreme loads
• Rated for up to 8,000 PSI load capacity, making it ideal for drag racing, monster truck, and tractor pull applications using nodular cast iron crankshafts
• U-Groove oil channel — 90° oil groove design maintains oil flow and increases bearing load capacity by expanding the lubricating surface area
• Optimized crush height — each bearing shell is individually engineered for precise crush fit and proper housing bore retention
• ElastoHydrodynamic eccentricity profile — computed through dynamic analysis for superior oil wedge formation and load distribution
• Industry-leading wall thickness tolerance — minimizes shell-to-shell variation for consistent bearing clearance across the full set
• Lead-free material — environmentally compliant and safe for engine builders

This 5-pair main bearing set is built for high-performance street, strip, and race engine builds on Ford small block Windsor engines. The HP Series is specifically developed for forced induction, nitrous oxide, and alcohol-fueled builds operating under high-load, short-duration conditions or medium-load, long-duration duty cycles.