Description

Mitsubishi OEM Cylinder Block Plug for Evo X (1050A900)

Firstly, Buy Mitsubishi OEM Cylinder Block Plug Evo X 1050A900 for the 4B11 engine. The Mitsubishi OEM Cylinder Block Plug for Evo X 1050A900 is a genuine Mitsubishi replacement component designed for the 4B11 engine used in the Mitsubishi Lancer Evolution X. This factory-specification cylinder block plug is an important small component for engine rebuilding, cylinder block servicing, restoration, and OEM-specification engine assembly. If you are rebuilding an Evo X 4B11 block and need to replace missing or removed factory hardware, the 1050A900 provides the correct Mitsubishi part-number reference for the application.

Mitsubishi lists 1050A900 as a cylinder block plug, while Evo X-specific parts information identifies it for the 2008–2015 Lancer Evolution X (CZ4A). The Evo X application uses two of these plugs, and the part is sold individually. The related MF660038 washer is also available separately for the cylinder block plug assembly.

Mitsubishi OEM Cylinder Block Plug for Evo X 1050A900

The cylinder block contains numerous plugs, pins, bushings, oil passages, and other small factory components. Although the 1050A900 is a relatively small part, using the correct OEM component is important when returning a 4B11 engine block to its intended configuration.

The 1050A900 cylinder block plug is particularly useful during an engine rebuild when the original plug has been removed, lost, damaged, or needs replacement. It is also a practical component to keep on hand when assembling a bare Evo X cylinder block.

For enthusiasts restoring an Evolution X, the correct Mitsubishi part number also makes it easier to match replacement hardware with factory diagrams and engine documentation.

Key Features

• Genuine Mitsubishi OEM cylinder block plug
• Mitsubishi part number 1050A900
• Designed for the Evolution X 4B11 engine
• Fits the CZ4A Lancer Evolution X application
• Used in the cylinder block assembly
• Two plugs are used in the Evo X application
• Sold individually
• Related washer: MF660038
• Suitable for engine rebuilding and restoration
• Ideal for OEM-specification 4B11 builds

STM Tuned identifies 1050A900 as a genuine OEM Mitsubishi 4B11 cylinder block plug for the Evo X and states that it is used in two locations.

Firstly: Genuine Mitsubishi OEM Replacement

Choosing a genuine Mitsubishi component is especially useful when rebuilding a performance engine such as the Evo X 4B11. OEM parts are manufactured for the intended application and are identified by the original Mitsubishi part number.

The 1050A900 gives engine builders a precise part-number reference instead of relying on a generic replacement plug. This can be helpful when assembling a bare block or completing an engine rebuild where several small factory components may have been removed during disassembly.

For an OEM restoration, using genuine Mitsubishi hardware also helps maintain consistency with the original engine assembly.

Secondly: Correct 4B11 Cylinder Block Application

The 1050A900 is listed within the Evo X 4B11 cylinder block parts catalog. Mitsubishi parts catalog information identifies it as PLUG, CYLINDER BLOCK, with diagram code 01385Q. The same catalog also lists the superseded number MN176262 alongside 1050A900.

This makes the OEM part number important when searching for the correct replacement. If you are comparing older documentation or an existing engine part number, MN176262 may appear as the previous number for 1050A900.

Thirdly: Ideal for Evo X Engine Rebuilds

The 1050A900 is a useful addition to an Evo X engine rebuild parts list. During a complete 4B11 rebuild, small components such as plugs, dowels, bushings, oil jets, and washers can be overlooked.

Replacing missing or questionable factory hardware before final assembly can help ensure that the engine block is complete.

The part is particularly relevant for:

• 4B11 engine rebuilds
• Evo X short-block assembly
• Bare cylinder block projects
• Engine restoration
• OEM replacement work
• Engine machining and reassembly
• Replacement of missing cylinder block hardware

STM Tuned groups the 1050A900 with other Evo X 4B11 cylinder block components, including the cylinder block bushings, dowel pins, oil jets, and related plugs.

Applications

The primary performance application for this listing is the 2008–2015 Mitsubishi Lancer Evolution X (CZ4A) equipped with the turbocharged 4B11 engine.

The Evo X-specific listing confirms the 1050A900 application for model years 2008–2015. Mitsubishi catalog data also identifies the part in the CZ4A cylinder-block assembly.

Because Mitsubishi uses the 1050A900 part number in other 4B-series engine applications as well, buyers should verify the exact vehicle and engine application when purchasing for a non-Evo Mitsubishi. Nengun’s Mitsubishi OEM catalog, for example, lists 1050A900 across several Mitsubishi models in addition to the Lancer Evolution X.

Specifications

Specification	Details
Brand	Mitsubishi OEM
Part Number	1050A900
Previous Number	MN176262
Component	Cylinder Block Plug
Engine	4B11
Vehicle	Mitsubishi Lancer Evolution X
Chassis	CZ4A
Model Years	2008–2015
Diagram Reference	01385Q
Quantity Used	2
Quantity Sold	1
Related Washer	MF660038

The plug is sold individually, so an Evo X engine requiring both factory plugs should be ordered with a quantity of two. The related MF660038 washer is available separately.

Why Replace the Cylinder Block Plug?

During an engine rebuild, the condition of small factory components should not be overlooked. A missing cylinder block plug can leave the engine assembly incomplete and may require sourcing the correct replacement before the block can be fully assembled.

The 1050A900 is also useful when purchasing or rebuilding a used Evo X bare block. An engine may have been previously disassembled for machining or modification, leaving some of its original plugs and hardware missing.

Using the correct Mitsubishi replacement makes parts identification easier and helps keep the 4B11 engine build organized.

Related 4B11 Engine Block Components

The 1050A900 can be purchased alongside other genuine Mitsubishi Evo X cylinder-block components when completing a 4B11 rebuild. Related components include the MF660038 cylinder block plug washer, 1050A003 M14x19 cylinder block bushing, 1050A004 cylinder block dowel pin, MD132806 M10x12 bushing, and MN187231 cylinder block chain oil jet.

This makes the 1050A900 a useful part to include when building a complete OEM engine hardware order rather than sourcing individual pieces after assembly has already begun.

Buy Mitsubishi OEM 1050A900 Online

If you are looking for a Mitsubishi OEM Cylinder Block Plug for Evo X, the 1050A900 is the genuine Mitsubishi part number to reference for the 4B11 cylinder block application. It is a practical OEM replacement for Evo X engine rebuilds, restoration projects, bare-block assembly, and factory-specification builds.

The part is sold individually, while two are listed for the Evo X application, so confirm the quantity needed before ordering. It is also recommended to verify the part number against your VIN or factory parts diagram, particularly when working with a replacement engine or modified cylinder block.

Frequently Asked Questions

What is Mitsubishi part number 1050A900?
1050A900 is a genuine Mitsubishi cylinder block plug used in the 4B11 engine application of the Lancer Evolution X.

Does 1050A900 fit the Evo X?
Yes. The Evo X-specific application lists the 1050A900 for the 2008–2015 Mitsubishi Lancer Evolution X (CZ4A).

What engine does the Evo X 1050A900 plug fit?
For the Evo X application, the plug is used with the turbocharged 4B11 engine and is listed within the cylinder block assembly.

How many 1050A900 plugs does an Evo X use?
The Evo X application uses two 1050A900 cylinder block plugs. The part is sold individually, so two should be ordered when replacing both.

Is 1050A900 the same as MN176262?
MN176262 is listed as a previous/replaced part number for 1050A900 in the Evo X-specific listing.

Does the washer come with the plug?
No. The related MF660038 20 mm washer is listed separately, so it should be ordered separately when required.

Is 1050A900 useful for a bare Evo X block rebuild?
Yes. It is listed as part of the Evo X 4B11 cylinder block hardware and can be useful when replacing missing or removed factory components during block assembly.

Can I use a generic plug instead?

For an OEM-specification engine rebuild, using the correct Mitsubishi part number is preferable because it provides a specific factory replacement rather than an unspecified generic component. Shop and order the Mitsubishi OEM Cylinder Block Plug for Evo X (1050A900) from evomotorparts.com to complete your 4B11 engine rebuild with the correct Mitsubishi OEM hardware.

Buy Mitsubishi OEM Cylinder Block Plug Evo X 1050A900 for the 4B11 engine, a genuine factory replacement for 2008–2015 Evolution X cylinder blocks.