King Engine Bearings MB5280XPC STDX XPC Race Series Main Bearing Set Ford V8 4.6L/5.4L SOHC

The King Engine Bearings MB5280XPC STDX is a premium XPC Race Series main bearing set engineered for Ford V8 4.6L and 5.4L SOHC engines. This set is purpose-built for high-performance and racing applications including circle track, drag racing, and offshore use with steel crankshafts. Thrustwashers are included.

XPC Race Series Technology:

• pMaxBlack™ Tri-Metal Overlay – A surface-hardened lead-tin-copper overlay electroplated onto a copper alloy substrate. Contains 5% copper content and utilizes a proprietary nano-scaled hardening process, delivering a 29% increase in overlay hardness (18.1 HV) and an overall 24% increase in load capacity up to 10,200 psi.
• pMaxKote™ Nano-Composite Polymer Coating – A factory-applied ceramic nano-composite polymer coating added over the pMaxBlack™ overlay as a functional fourth layer. Enhances wear and cavitation resistance and protects bearing surfaces during periods of oil starvation and minimum oil film thickness — with no added wall thickness, preserving original oil clearances.
• SecureBond™ Construction – A micro-etch surface preparation process that strengthens tri-metal structural integrity and reduces the risk of delamination under extreme load or metal-to-metal contact conditions.
• Enhanced Intermediate Layer – Tin content increased to 4.5%, making the intermediate layer 22% harder (115 HV) with a load-carrying capacity of 17,000 psi.
• Precision Tolerances – Manufactured entirely in-house at King Engine Bearings, including polymer coating and sorting, ensuring the most consistent shell-to-shell wall thickness in each set.

Set Details:

• Size: Standard (STD)
• Quantity: 5 pairs (main bearing set)
• Includes thrustwashers
• Part Number: MB5280XPC / MB5280XPCSTDX

King Engine Bearings has specialized exclusively in engine bearings since 1960, making the XPC Series one of the most technically advanced racing main bearing sets available for Ford's modular V8 platform.