Fits select 1986-2005 Mazda, Ford, Kia, and Mercury models including Miata, Protege, 323, Escort, Capri, and Rio (B3 / B5 / B6 / B6-T / ZM).

Ensure your engine rebuild meets exact tolerances with the King Engine Bearings MB5304XP0.25 main bearing set. This +0.25mm oversize set is designed for crankshafts that have been ground to a specific undersize, providing the necessary oil clearance and structural support for both high-performance and daily-driven applications. King's XP-series bearings are engineered with a tri-metal construction to handle higher loads and provide superior fatigue resistance.

• Manufacturer Part Number: MB5304XP0.25
• Bearing Size: +0.25mm Oversize
• Engine Compatibility: Mazda B6, B6-T, ZM, B3, B5
• Construction: High-load tri-metal bearing material
• Application: Crankshaft main journal replacement set

Fits select 1986-2005 Mazda 323, Miata, and Protege; Ford Escort; Mercury Capri and Tracer; and Kia Rio (B3, B5, B6, B6-T, and ZM engines).

This King Engine Bearings XP-Series main bearing set is engineered for high-performance engine rebuilds where precision clearances and high load capacity are required. Designed to accommodate crankshafts that have been ground to a +.025mm oversize, these bearings feature King's advanced tri-metal construction to withstand the increased cylinder pressures found in forced induction or high-RPM applications.

• Specifically designed for Mazda B-series engine architectures (B3, B5, B6, B6-T, and ZM).
• XP-Series tri-metal construction for superior fatigue strength and load-carrying capacity.
• Ideal for street-performance and dedicated racing builds.
• Ensures proper crankshaft support and oil film maintenance.

• Manufacturer Part Number: MB5304XP.026
• Oversize: +.025mm
• Material: Tri-metal (XP-Series)
• Bearing Type: Main Bearing Set

This King Main Bearing Set is designed for precision crankshaft support and optimal oil clearance in high-performance and daily-driven GM LS-series engines. Engineered as a standard (STD) size replacement, these bearings are essential for maintaining engine longevity and internal stability during a rebuild.

• Fits select 1997-2020 GM vehicles (Chevrolet, GMC, Cadillac, Hummer, Buick, Isuzu, and Avanti) with 4.8L, 5.3L, 5.7L, and 6.0L engines.
• Compatible with engine codes L20, LS1, LS2, LS4, and LS6.
• Precision manufactured for the 294/325/345/364 CI block platforms.
• Manufacturer Part Number: MB5293SI
• Bearing Size: Standard (STD)

Each set is built to exacting tolerances to ensure a perfect fit in factory or aftermarket housings, replacing worn OE bushings to restore engine performance.

Fits select 1998-2008 Toyota Celica, Corolla, Matrix, and MR2 Spyder models equipped with the 1.8L 1ZZ-FE engine.

Ensure your engine's bottom end is properly supported with this King Engine Bearings AM-Series main bearing set. Designed as a precise replacement for worn factory components, these bearings provide the consistent oil clearances and load distribution required to maintain crankshaft integrity. Whether you are performing a routine overhaul or a complete engine rebuild, the King AM-Series delivers the reliability needed for the 1ZZ-FE platform.

• Manufacturer Part Number: MB5287AM
• Bearing Size: STD (Standard)
• Material: AM-Series aluminum based alloy for durability and corrosion resistance
• Engine Compatibility: Toyota 1ZZ-FE

Vehicle Compatibility:

• 1998-2008 Toyota Corolla (CE, LE, S, VE)
• 2000-2005 Toyota Celica GT
• 2000-2005 Toyota MR2 Spyder Base
• 2003-2008 Toyota Matrix (Base, XR)

This King Engine Bearings Performance Main Bearing Set (MB5283XPC) fits select 1993-2010 Ford, Lincoln, and Mercury vehicles equipped with the 4.6L V8 engine, covering both SOHC and DOHC configurations. Engineered for high-stress racing and street performance, these bearings are designed to handle higher loads and RPMs than standard OE components.

The XPC series features an advanced polymer coating that provides a critical layer of protection during cold starts and protects against seizure during momentary oil pressure drops. The tri-metal construction offers superior fatigue resistance and durability for internal engine builds.

• Manufacturer Part Number: MB5283XPC
• Engine Compatibility: Ford 4.6L V8 (SOHC/DOHC 24v)
• Series: Performance XP-Series with polymer coating
• Year Range: 1993-2010
• Materials: High-strength tri-metal with anti-friction coating
• Includes: Complete main bearing set

Vehicle Fitment: Fits 1993-2010 Ford Mustang, F-150, Explorer, Expedition, E-Series, and F-250; Lincoln Mark VIII, Continental, and Aviator; Mercury Marauder and Mountaineer; plus select Avanti, Panoz, and Qvale models.

Fits select 1993-2010 Ford, Lincoln, Mercury, Panoz, Qvale, and Avanti models.

King Engine Bearings Performance series main bearing sets are engineered to provide the load-carrying capacity and reliability required in high-performance engine builds. This set, part number MB5283HP, is designed for standard size (STD) crankshaft journals, offering precise tolerances and consistent oil clearance. By replacing worn or OE-grade bearings with these performance-spec components, you ensure a more stable rotating assembly under the increased stress of high-RPM or high-load operation.

• Brand: King Engine Bearings
• Series: Performance
• Part Number: MB5283HP
• Bearing Size: STD (Standard)
• Material construction optimized for high-load durability
• Designed for precision fitment and superior oil film maintenance

Fits select 1991-2016 Ford, Lincoln, and Mercury vehicles equipped with V8-4.6L or 5.4L modular engines. Note: This set will not fit 2013-2014 Ford Mustang Shelby GT500 models.

King HP Series main bearings are specifically engineered for high-performance street and entry-level track applications. Designed to withstand the increased loads and higher RPMs found in performance builds, these bearings provide the reliability needed for your Ford V8 engine overhaul. This set is provided in a standard (STD) size to maintain factory oil clearances with a precision-ground crankshaft.

• Manufacturer Part Number: MB5280HP
• Engine Fitment: Ford/Lincoln/Mercury V8-4.6L and 5.4L
• Size: Standard (STD)
• Series: King HP (High Performance)
• Material: Performance-grade bi-metal silicon aluminum
• Application: Direct replacement for worn OE main bearings in performance-oriented builds

Fits select 1995-2010 Chrysler, Dodge, Jeep, and Plymouth models including the PT Cruiser, Stratus, Neon SRT-4, Wrangler, and Liberty (148 / 148 Turbo DOHC 16V).

The King Engine Bearings MB5270AM Main Bearing Set is engineered to provide precise oil clearances and reliable crankshaft support for standard-sized journals. This set belongs to King’s AM series, featuring an aluminum-based alloy construction that offers excellent thermal conductivity and corrosion resistance. Designed to meet or exceed OE specifications, these bearings are an essential choice for engine rebuilds where maintaining strict tolerances in the bottom end is critical for long-term durability, whether in naturally aspirated or turbocharged applications.

• Manufacturer Part Number: MB5270AM
• Bearing Size: STD (Standard)
• Engine Compatibility: 148 DOHC 16V and 148 Turbo DOHC 16V
• Component Type: Main Bearing Set
• Construction: High-strength aluminum alloy for consistent performance
• Fitment: Direct replacement for original equipment bearings

Fits select 1990-2019 Acura and Honda models, including Integra, Civic, Accord, CR-V, RSX, and TSX with A-Series, B-Series, or K-Series engines.

Designed for high-performance builds and competition use, this King pMaxKote main bearing set provides the tight tolerances and material durability required for high-RPM and high-load environments. The STDX sizing offers standard journal diameter with extra oil clearance (typically .001" additional) to ensure consistent lubrication and reduced friction during extreme operating conditions. These bearings feature King's pMaxKote, a unique nano-composite polymer coating that protects against metal-to-metal contact during cold starts and oil pressure drops without increasing bearing thickness.

• Series: XP (Performance)
• Coating: pMaxKote factory-applied nano-composite polymer
• Sizing: STDX (Standard with extra oil clearance)
• Construction: Tri-metal pMax Black material for superior load capacity
• Manufacturer Part Number: MB5259XPCSTDX
• Application: Main crankshaft journals for Honda/Acura A, B, and K-series engines

Fits select 1990-2019 Acura and Honda models, including Integra, Accord, Civic, CR-V, Element, RSX, RDX, and TSX equipped with A-series, B-series, or K-series engines.

Engineered for high-output racing and performance street builds, this King pMaxKote Performance Main Bearing Set provides the critical oil clearance and durability required for high-RPM operation. These bearings feature King's proprietary pMaxKote, a factory-applied nano-composite polymer coating that significantly reduces friction and wear during cold starts or oil starvation events. The +.026mm sizing allows for precise oil clearance adjustments when machining the crankshaft or housing bores to specific tolerances.

• Manufacturer Part Number: MB5259XPC.026
• pMaxKote nano-composite polymer coating protects against metal-to-metal contact
• High-strength tri-metal construction for superior load capacity
• Precision-engineered for A-Series, B-Series, and K-Series engine architectures
• Increased fatigue resistance for forced induction or high-compression applications
• Specifically sized at +.026mm for expert engine assembly requirements

Fits select 1990-2019 Acura and Honda models equipped with A-Series, B-Series, and K-Series engines, including Integra, Civic Si, Accord, CR-V, and RSX.

The King pMaxKote Performance Main Bearing Set (MB5259XPC) is engineered for high-output engine builds where load capacity and seizure resistance are critical. These standard (STD) size bearings feature King’s proprietary pMaxKote, a nano-composite polymer coating applied over the pMaxBlack tri-metal structure. This advanced ceramic-based overlay provides exceptional protection during cold starts and high-RPM operation by reducing friction and preventing metal-to-metal contact without altering critical oil clearances.

• Manufacturer Part Number: MB5259XPC
• Bearing Size: STD (Standard)
• Engine Series: Honda A, B, and K Engines
• pMaxKote coating for superior heat and seizure resistance
• Tri-metal construction designed for extreme racing conditions
• Maintains hydrodynamic lubrication under heavy crank loads
• Precision-manufactured to strict tolerances for consistent oil pressure

This King Engine Bearings main bearing set is designed to restore or maintain precise crankshaft oil clearances in select 1990-2019 Acura and Honda engines, specifically the B18 and K-series (K20/K24) platforms. These standard-size (STD) bearings are engineered for reliable performance in daily driving and moderate performance applications where consistent oil pressure and load distribution are critical.

• Manufacturer Part Number: MB5259AM
• Engine Compatibility: B18A1, B18B1, B18C1, B18C5, K20A, K24A
• Bearing Size: STD (Standard)
• Optimized oil hole alignment for improved lubrication
• Precision-manufactured to meet or exceed OE tolerances

Fits select 1990-2019 Acura and Honda models, including Integra, Civic, Accord, RSX, TSX, and CR-V. This set provides the foundational support your bottom end needs during a rebuild, ensuring the crankshaft rotates smoothly within the block.

Fits select 1996-2013 Hyundai and Kia models, including Elantra, Tiburon, Tucson, Spectra, Spectra5, and Sportage (2.0L G4GC engine).

This King Engine Bearings Main Bearing Set (MPN: MB5256AM) provides critical crankshaft support and maintains precise oil clearances for your engine rebuild or service. Engineered as a direct-fit replacement for the factory components, these standard-size (STD) bearings are manufactured to tight tolerances to ensure reliable operation and durability in the G4GC engine block.

• Manufacturer Part Number: MB5256AM
• Bearing Size: STD (Standard)
• Engine Compatibility: 2.0L G4GC
• Replaces worn OE main bearings with precision-engineered components
• Designed for consistent oil flow and crankshaft stability

Fits select 1991-2002 Infiniti G20 and Nissan 200SX, NX, and Sentra models (2.0L).

The King XP-Series main bearing set is designed for high-performance Nissan SR20DE and SR20DET engines that demand superior load capacity and tight tolerances. These bearings are part of the King Racing line, featuring the pMax Black tri-metal structure. This advanced metallurgical construction allows for 24% greater load capacity and 17% more fatigue strength than standard bearings, making them essential for high-RPM racing and forced induction builds.

This specific set is provided in STDX size, which offers .001 inch (.025mm) of extra oil clearance compared to standard size. This is a critical adjustment for engine builders looking to optimize oil flow and cooling in high-heat racing environments.

• Manufacturer Part Number: MB5243XPSTDX
• Series: XP-Series Performance
• Material: pMax Black Tri-Metal
• Size: STDX (.001" Extra Oil Clearance)
• Engine Application: Nissan 2.0L SR20DE / SR20DET
• Increased fatigue resistance for high-load competition engines
• Bull's Eye Tolerance for consistent oil clearance across all journals

Fits select 1991-2002 Nissan and Infiniti vehicles equipped with the 2.0L SR20DE or SR20DET engine, including 200SX, Sentra, NX, and G20 models.

This King Engine Bearings Performance Coated Main Bearing Set (MPN MB5243XPC) is engineered for high-performance Nissan SR20 applications where reliability and friction reduction are critical. These bearings feature a specialized coating designed to withstand extreme loads and provide an additional layer of protection against oil starvation and debris during high-RPM operation. As a standard (STD) size set, it is intended for use with crankshafts that remain within factory tolerances.

• Manufacturer Part Number: MB5243XPC
• Size: STD (Standard)
• Engine Compatibility: Nissan SR20DE / SR20DET (2.0L)
• Material: Performance-grade coated alloy for superior thermal management and durability
• Fitment: Replaces factory main bearings in OE housings

Fits select 1991-2002 Infiniti G20 and Nissan 200SX, NX, and Sentra (2.0L).

This King Engine Bearings XP-Series performance main bearing set is engineered for high-output Nissan SR20DE and SR20DET engines. Designed for demanding applications such as forced induction and high-RPM racing, these bearings feature King’s advanced tri-metal construction to provide superior load-carrying capacity and fatigue resistance. This specific set is ground to a +0.25mm (.010") undersize, making it the ideal choice for engine builds where the crankshaft journals have been machined to restore a perfect finish.

• Series: XP-Series Performance
• Size: +0.25mm (.010") Undersize
• Engine Code: Nissan SR20DE / SR20DET (2.0L)
• Construction: High-load tri-metal pMax Black material
• Installation: Direct replacement for OE main bearings (machining required for undersize fitment)
• Manufacturer Part Number: MB5243XP0.25

Built with precise tolerances, these bearings ensure consistent oil clearance and reliable bottom-end stability for professional engine builders and performance enthusiasts alike.

Fits select 1991-2002 Infiniti G20 and Nissan 200SX, NX, and Sentra (2.0L).

The King Engine Bearings XP-Series Performance Main Bearing Set is engineered for high-RPM, high-output engines where standard bearings often reach their limits. Specifically designed for the Nissan SR20DE and SR20DET 2.0L platforms, the MB5243XP set provides the precision tolerances and load-bearing capacity required for performance racing and street builds. These bearings feature a tri-metal construction designed to handle increased cylinder pressures and provide reliable oil clearance.

• Manufacturer Part Number: MB5243XP
• Series: XP Performance
• Size: STD (Standard)
• Engine Compatibility: Nissan SR20DE / SR20DET (2.0L)
• Construction: Advanced tri-metal material for superior fatigue resistance

Vehicle Fitment List

Fits select 1971-2005 Mitsubishi, Dodge, Hyundai, Eagle, and Plymouth models equipped with the 6-bolt 4G63 or 4G64 engine, including 1st Gen DSM applications.

King XP Series main bearings are engineered for high-performance environments where standard OE-style bearings may lack the capacity for increased loads. These performance bearings are specifically designed for racing and forced induction builds that demand superior fatigue resistance. The STDX sizing provides .001" of additional oil clearance compared to standard bearings, facilitating improved oil flow and thermal management in high-RPM conditions.

• Manufacturer Part Number: MB5227XPSTDX
• Engine Compatibility: Mitsubishi 4G63 / 4G64 (6-Bolt Crankshaft)
• Bearing Series: XP Series Performance
• Size: STDX (Standard with .001" extra oil clearance)
• Construction: High-load tri-metal performance material

Fits select 1971-2005 Mitsubishi, Dodge, Eagle, Hyundai, and Plymouth models with 4G63 or 4G64 6-bolt engines.

The King Engine Bearings performance main bearing set is engineered for high-load engine builds and precision performance. Specifically designed for the 6-bolt crankshaft configuration found in 1st Gen DSM and various Mitsubishi-powered applications, this set provides the durability and precise oil clearances required for reliable engine operation under stress. These bearings are a direct replacement for worn OE components, offering superior fatigue resistance during high-RPM or turbocharged use.

• Specifically for 4G63 and 4G64 6-bolt crankshaft engines
• Designed for high-performance rebuilds and increased durability
• Maintains consistent oil film and critical clearances
• Size: STD (Standard)
• Manufacturer Part Number: MB5227XP

Fits select 1993-2002 Ford Probe, Mazda 626, and Mazda MX-6 (FS-DE / FP / FS L4 DOHC 16V).

King Engine Bearings main bearing sets are engineered for precise oil clearance and reliable crankshaft support. This standard size set is designed to replace worn factory bearings, restoring engine geometry and ensuring durable performance for L4 DOHC 16-valve engines. Manufactured to rigorous tolerances, the MB5171AM set provides the consistent surface quality required for high-stress automotive environments.

• Manufacturer Part Number: MB5171AM
• Bearing Size: STD (Standard)
• Engine Families: Mazda FS-DE L4, FP L4, FS L4 DOHC 16-Valve
• Application: Full crankshaft main bearing set

Fits select 1973-2001 Honda Accord, Civic, Odyssey, and Prelude, Acura CL, and Isuzu Oasis.

This King Engine Bearings crankshaft main bearing set (MPN MB5168XPSTDX) is engineered for high-performance engine builds utilizing 50mm journals. As part of King's performance line, these bearings are designed to handle higher loads and RPMs than standard OE components. The STDX sizing provides standard extra clearance, which is critical for maintaining an optimal oil film in racing applications where thermal expansion and high-speed lubrication are primary concerns.

• Manufacturer Part Number: MB5168XPSTDX
• Bearing Size: STDX (Standard Extra Clearance)
• Journal Diameter: 50mm
• Material: Performance-grade tri-metal construction
• Configuration: Complete set for one crankshaft