King MB5283XP0.25 +0.25mm XP Main Bearings Ford Modular 4.6L DOHC 24V Cobra V8

Regular price: $138.95
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Product Specification:

SKU:KINGMB5283XP0.25

MPN: MB5283XP0.25

UPC: 611500536038

Weight: 1.3 lb

Inventory: 4

Type: Bearings

Vehicle Fitment

1993-2004 Ford Mustang SVT Cobra (Base, Convertible, R, RWD, 4.6L DOHC 24V V8)
2003-2004 Ford Mustang Mach 1 (Base, RWD, 4.6L DOHC 24V V8)
1993-1998 Lincoln Mark VIII (Base, LSC, RWD, 4.6L DOHC 24V V8)
1995-2002 Lincoln Continental (Base, RWD/FWD, 4.6L DOHC 24V V8)
2003-2005 Lincoln Aviator (Base, Premium, RWD/AWD, 4.6L DOHC 24V V8)
2003-2004 Mercury Marauder (Base, RWD, 4.6L DOHC 24V V8)

Fitment Notes

Fits Ford 4.6L DOHC 24-valve V8 Modular engines only - does NOT fit the 2-valve or 3-valve SOHC variants (use MB5280XP0.25 for those applications)
This is a +0.25mm undersize set - for use on crankshafts ground 0.25mm under standard main journal diameter; always measure journals with a precision micrometer before ordering
XP Series = pMaxBlack tri-metal race construction; designed for high-performance and race applications using forged steel crankshafts under sustained high load
Set includes thrust washers - no separate purchase required
2003-2004 Mustang SVT Cobra used an iron block (Romeo) with 4-bolt main caps - confirmed fitment; other DOHC applications used aluminum blocks
Does not fit the supercharged 5.4L DOHC (Shelby GT500, Ford GT) - those require a separate bearing set

Features

pMaxBlack tri-metal overlay is 24% harder than conventional race bearings, rated up to 10,200 PSI load capacity
SecureBond micro-etch adhesion process prevents delamination under high-RPM and sustained thermal cycling
Narrowed design accommodates large-radius aftermarket and OE forged steel crankshafts
Enlarged chamfered oil holes improve lubrication delivery under high-load race conditions
EccentriX eccentricity profiling ensures a stable hydrodynamic oil film across the full journal surface
Bull's Eye Tolerance wall thickness held to ±0.0001" for consistent clearance across all 5 main journals
Thrust washers included - covers all components needed for a complete main bearing service
Lead-free construction meets current environmental compliance standards

Specifications

Part Number: MB5283XP0.25
Undersize: +0.25mm (0.010")
Series: XP (pMaxBlack Tri-Metal Race Bearings)
Engine: Ford 4.6L DOHC 24-Valve V8 Modular (Romeo / Windsor block)
Overlay Load Capacity: Up to 10,200 PSI
Wall Thickness Tolerance: ±0.0001"
Position: Crankshaft Main (Upper and Lower shells)
Quantity: 5 pairs (10 shells total - full V8 main bearing set)
Available Sizes: STD / STDX / .026mm / +0.25mm

Included Components

5x Upper Main Bearing Shells
5x Lower Main Bearing Shells
2x Thrust Washers

Product Description

The King MB5283XP0.25 is a +0.25mm undersize XP Series race-grade crankshaft main bearing set engineered for Ford's 4.6L DOHC 24-valve V8 Modular engine - the high-performance heart of the Mustang SVT Cobra, Mustang Mach 1, Lincoln Mark VIII, Lincoln Continental, Lincoln Aviator, and Mercury Marauder. Using King's pMaxBlack tri-metal structure - 24% harder than conventional race bearings and rated to 10,200 PSI - this set is designed for high-output builds on crankshafts ground 0.25mm under standard main journal diameter, where standard-size bearings would produce excessive oil clearance.

Thrust washers are included in the set, covering all components needed for a complete main bearing installation in one purchase. This set is specific to the 4.6L DOHC 24-valve configuration and does not fit the 2-valve or 3-valve SOHC Modular variants. Always verify your engine configuration and measure crankshaft main journals with a precision micrometer before ordering. For crankshafts at factory diameter, the standard-size MB5283XP or the STDX variant with extra clearance are the correct choices.