Description

Mitsubishi OEM Bare Cylinder Head for Evo X

Firstly, BUY Mitsubishi OEM Bare Cylinder Head for Evo X 4B11T (1005B271), Restore, rebuild, or upgrade your Mitsubishi Evolution X 4B11T engine with the Mitsubishi OEM Bare Cylinder Head for Evo X. This genuine Mitsubishi factory replacement cylinder head provides a solid OEM foundation for rebuilding a damaged, worn, or modified 4B11T cylinder head while maintaining the factory engine architecture.

The primary OEM part number for the 2008–2015 Mitsubishi Lancer Evolution X is 1005B271. A separate configuration is used for the 2015 Evolution X Final Edition, with 1005C881 listed for that application and 1005C788 as a replacement number. Because cylinder-head part numbers can vary by model year and vehicle specification, confirming the correct part number against the vehicle VIN is recommended before ordering.

The 4B11T cylinder head is one of the most important components in the Evolution X engine. It contains the combustion chambers and provides the mounting, sealing, oil, coolant, and valvetrain interfaces required for the turbocharged 4B11T engine. Using a genuine Mitsubishi OEM replacement gives an engine builder a factory-designed foundation for a reliable rebuild or performance engine project.

Genuine Mitsubishi OEM 4B11T Cylinder Head

The Mitsubishi OEM Bare Cylinder Head Evo X is designed around the 4B11T turbocharged engine used in the Evolution X. OEM cylinder-head components are manufactured to the original Mitsubishi specifications for the engine application, providing the correct basic architecture for rebuilding the cylinder head.

This makes the bare cylinder head particularly useful when an original head has suffered damage from overheating, mechanical failure, excessive machining, cracking, or other conditions that make replacement preferable to rebuilding the existing casting.

A new OEM head can also provide an excellent foundation for an enthusiast or professional engine builder who wants to assemble the valvetrain according to a specific engine combination.

BUY Mitsubishi OEM Bare Cylinder Head for Evo X 4B11T (1005B271), Genuine factory replacement head for 2008–2015 Mitsubishi Evolution X engine rebuilds.

OEM Part Number 1005B271

For most 2008–2015 Mitsubishi Lancer Evolution X applications, the primary OEM cylinder-head part number is 1005B271. Mitsubishi parts references and Evolution X OEM parts suppliers identify 1005B271 as the 4B11T cylinder-head assembly.

The 2015 Final Edition requires particular attention because listings identify 1005C881 as the applicable part number, replacing 1005C788. If your Evo X is a Final Edition or has a different engine specification, verify the VIN and OEM catalog information before purchasing.

What Comes With the Bare Cylinder Head?

Although this product is described as a bare cylinder head, it is important to understand that “bare” does not necessarily mean a completely empty casting.

Current OEM listings for the 1005B271 cylinder head identify components including:

• Cylinder head
• Cam caps
• Cam-cap bolts
• Cylinder-head plug
• Cylinder-head bushings
• Intake and exhaust studs
• Intake and exhaust valve guides
• Intake and exhaust valve seats

The exact contents can vary according to the supplier and specific OEM configuration, so buyers should confirm the included components before ordering.

The complete valvetrain and other components should not be assumed to be included simply because the cylinder head is supplied assembled with certain supporting hardware.

Ideal Foundation for a 4B11T Rebuild

The Mitsubishi Evolution X 4B11T is a turbocharged performance engine, making the condition of its cylinder head especially important. The cylinder head must maintain proper sealing, valve operation, camshaft alignment, oil circulation, and coolant flow throughout the engine’s operating range.

If your original head has been damaged or is no longer suitable for rebuilding, an OEM replacement can save the time and expense associated with attempting to recover an unsuitable casting.

Firstly, an OEM cylinder head gives the engine builder a factory-designed foundation with the correct basic geometry and mounting configuration.

Secondly, the bare-head format allows the builder to install the appropriate valves, springs, retainers, seals, and other valvetrain components for the intended engine combination.

Thirdly, it provides an excellent starting point for both OEM restoration and professionally prepared 4B11T performance builds.

Suitable for OEM and Performance Builds

The OEM bare cylinder head is not limited to stock restoration. It can also serve as the foundation for a performance-oriented Evo X engine build.

A professional engine builder can prepare the head according to the requirements of the complete engine combination. Depending on the build, this may include upgraded intake and exhaust valves, valve springs, retainers, valve stem seals, performance cams, upgraded hardware, and cylinder-head porting.

For example, performance components such as GSC 4B11 Evo X Intake Valves, GSC exhaust valves, and GSC 4B11T valve stem seals can be incorporated into a properly planned cylinder-head build.

However, any machining or modification should be performed by a qualified machine shop using the correct Mitsubishi specifications and the specifications of the selected aftermarket components.

2008–2015 Evo X Fitment

The primary 1005B271 cylinder head is listed for the Mitsubishi Lancer Evolution X/CZ4A equipped with the 4B11T engine. Fitment information covers the 2008–2015 Evolution X range, including common GSR, MR, and SE applications.

The part is also catalogued for later 4B11T Evo X applications in certain markets, which makes VIN verification particularly important when ordering an OEM cylinder head.

Application:

• Mitsubishi Lancer Evolution X
• Mitsubishi Evolution X
• Mitsubishi Evo X
• CZ4A
• 4B11T turbocharged engine
• 2008–2015 applications
• 2015 Final Edition — verify the specific OEM part number

When Should You Replace the Cylinder Head?

Replacing the cylinder head may make sense when the original casting has suffered significant damage or cannot be economically restored.

Common situations include:

• Cracked cylinder head
• Severe overheating damage
• Damaged valve seats
• Excessive previous machining
• Damaged cam-cap areas
• Severe corrosion
• Major valvetrain damage
• Engine rebuild requiring a fresh OEM foundation
• Performance build requiring a new cylinder-head assembly

A machine shop should inspect the original head before deciding whether replacement or refurbishment is the better option.

Cylinder Head Preparation

Even with a genuine OEM replacement, professional inspection and preparation are recommended before final engine assembly.

The cylinder head should be checked for the correct surface condition, valve-seat condition, guide clearance, valve sealing, camshaft alignment, and overall dimensional requirements.

If the head is being used for a performance build, the final machining should be coordinated with the valves, springs, retainers, cams, and other components that will be installed.

This is particularly important when using oversized valves or aftermarket valvetrain components. The machine shop should follow the specifications supplied by the component manufacturer and verify the complete valvetrain geometry before assembly.

Build Your Evo X 4B11T Cylinder Head

A new OEM cylinder head can be the starting point for a complete Evo X engine rebuild. Depending on your goals, you can combine the head with:

• GSC 4B11T intake valves
• GSC 4B11T exhaust valves
• GSC Viton valve stem seals
• Performance valve springs
• Upgraded retainers
• Valve keepers and locks
• Performance camshafts
• OEM Mitsubishi head gasket
• OEM head bolts or appropriate upgraded fasteners

Choosing components that work together is important for maintaining correct valve-to-piston clearance, installed height, spring pressure, cam timing, and overall valvetrain reliability.

Why Buy Mitsubishi OEM Bare Cylinder Head from evomotorparts?

At evomotorparts, we specialize in Mitsubishi Evolution OEM, replacement, and performance engine components for Evo enthusiasts, builders, tuners, and performance shops.

When you buy Mitsubishi OEM Bare Cylinder Head Evo X from evomotorparts, you can source a factory-quality foundation for your 4B11T project.

Key benefits include:

• Genuine Mitsubishi OEM cylinder-head application
• Designed for the Evo X 4B11T
• OEM part number 1005B271 for applicable 2008–2015 models
• Suitable for engine rebuilding and replacement
• Excellent foundation for performance cylinder-head builds
• Compatible with appropriate OEM and aftermarket valvetrain components
• Competitive pricing
• Worldwide shipping
• Dedicated Mitsubishi Evolution parts support

Whether you are restoring a damaged Evo X, rebuilding a high-mileage 4B11T, or starting a new performance engine project, an OEM Mitsubishi cylinder head provides a dependable foundation for the build.

Frequently Asked Questions

What is the OEM part number for the Evo X bare cylinder head?

The primary OEM part number is 1005B271 for applicable 2008–2015 Mitsubishi Evolution X 4B11T models.

Does the 1005B271 cylinder head fit the Evo X?

Yes. The 1005B271 is listed for the Mitsubishi Lancer Evolution X/CZ4A with the 4B11T engine. Always confirm fitment using the VIN before ordering.

Is this a complete cylinder head?

It is sold as a bare cylinder head, rather than a complete ready-to-run valvetrain assembly. Current listings indicate that the 1005B271 configuration includes items such as cam caps, cam-cap bolts, guides, seats, studs, bushings, and the cylinder-head plug. Confirm the exact package contents before purchase.

Does it include valves and valve springs?

Do not assume that valves, springs, retainers, or other complete valvetrain components are included. The exact contents should be confirmed for the specific listing.

Can I use this for a performance Evo X build?

Yes. The OEM cylinder head can provide an excellent foundation for a compatible 4B11T performance build. Upgraded valves, springs, retainers, seals, and other components can be installed by a qualified engine builder.

What part number is used for the 2015 Final Edition?

The 2015 Final Edition is listed with 1005C881, while 1005C788 is identified as a replacement number. Verify the VIN and exact vehicle specification before ordering.

Should the cylinder head be inspected before installation?

Yes. Even a new OEM cylinder head should be inspected and prepared according to the requirements of the complete engine build before final assembly.

Conclusion

The Mitsubishi OEM Bare Cylinder Head for Evo X is a high-quality factory foundation for replacing, rebuilding, or upgrading the 4B11T cylinder head. With the primary 1005B271 application covering many 2008–2015 Evolution X models, it provides the OEM architecture needed for a professional engine rebuild while leaving the builder flexibility to select the appropriate valvetrain components.

For a damaged or heavily modified original head, replacing the casting can be a practical solution. For a performance 4B11T, the OEM head can also provide a strong starting point for a professionally prepared cylinder-head package with upgraded valves, springs, retainers, seals, and cams.

Buy Mitsubishi OEM Bare Cylinder Head for Evo X online from evomotorparts and build your 4B11T engine around a genuine Mitsubishi OEM cylinder-head foundation. Always verify the OEM part number, vehicle application, and included components before ordering.