King Engine Bearings MB5280XPC XPC Series pMaxKote Coated Main Bearing Set Ford 4.6L 5.4L V8 SOHC STD

The King Engine Bearings MB5280XPC is a premium XPC Series crankshaft main bearing set designed for Ford 4.6L and 5.4L V8 SOHC engines. Built for high-performance and racing applications, this set combines King's advanced tri-metal construction with their proprietary pMaxBlack™ overlay and pMaxKote™ nano-composite polymer coating — delivering a four-layer bearing system engineered for extreme load conditions.

pMaxBlack™ Tri-Metal Construction:

• Surface-hardened lead-tin-copper overlay electroplated onto a copper alloy substrate
• Contains 5% copper content — delivering a 29% increase in overlay hardness (18.1 HV) over standard bearings
• Intermediate layer uses 4.5% tin content, achieving 115 HV hardness — 22% harder than typical race bearings — with a load-carrying capacity of 17,000 psi
• Overall load capacity reaches 10,200 psi, a 24% improvement over conventional tri-metal overlays
• SecureBond™ micro-etch surface preparation process strengthens tri-metal structural integrity and reduces risk of delamination under extreme loads

pMaxKote™ Nano-Composite Polymer Coating:

• Factory-applied ceramic nano-composite polymer coating, applied over the pMaxBlack™ overlay as part of the manufacturing process
• Enhances wear and seizure resistance, and protects bearing surfaces during periods of oil starvation and minimum oil film thickness
• Proven to protect during metal-to-metal contact and against the erosive effects of cavitation
• Applied with no added wall thickness — oil clearances are not altered

XPC Series Geometric Features:

• Narrowed profile designed for large-radius crankshafts
• Enlarged, chamfered oil holes with full, 3/4-in., or 1/2-in. grooving for improved oiling
• Wall thickness tolerances maintained at an industry-leading ±0.0001 in.
• Fits 2V and 3V Ford modular engines

Set Details:

• Thrust washers included
• Standard (STD) size
• Ideal for circle track, drag racing, offshore, and other performance applications using steel crankshafts

King Engine Bearings has specialized exclusively in engine bearings since 1960, producing all half-shell rod and main bearings in-house to maintain strict quality and tolerance standards. The MB5280XPC represents their top-tier XPC racing line for the Ford modular V8 platform.