What does the +0.25mm sizing mean for these bearings?

The +0.25mm sizing indicates that these bearings are a quarter millimeter larger in diameter than standard size. This is used when the crankshaft journals have been machined undersize during an engine rebuild to restore proper clearance.

What is the PMaxBlack overlay and Radialock feature?

PMaxBlack is King's overlay material that offers superior load capacity, making it suitable for performance engines. Radialock grooves help ensure the correct amount of 'crush height,' which is crucial for proper bearing seating and oil retention.

Are these bearings suitable for a stock engine rebuild?

While these bearings are well-built for performance, they are specifically sized at +0.25mm. This size is typically used when the crankshaft has been machined undersize. For a standard rebuild, you would need bearings that match the current size of your crankshaft journals.

Specifications

Brand: King Engine Bearings
Part #: MB5220XP0.25
UPC: 611500542237

King Subaru WRX/STi EJ20 EJ22 EJ25 Flange #3 Position Performance Main Bearing Set - Size +0.25mm

Name: King Subaru WRX/STi EJ20 EJ22 EJ25 Flange #3 Position Performance Main Bearing Set - Size +0.25mm
Brand: King Engine Bearings
SKU: king-engine-bearings-king-subaru-wrx-sti-ej20-ej22-ej25-flange-3-position-perfor-t14-4333168
Price: 103.54 USD
Availability: BackOrder

$103.54

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King Engine Bearings performance main bearing set for Subaru WRX/STi, Forester, Legacy and more. Size +0.25mm.

Key Features

Fits a wide range of Subaru and Saab vehicles including the WRX STI, Forester, Legacy, and 9-2X.
Features King's PMaxBlack overlay for improved load capacity.
Includes Radialock grooves for optimal crush height.
Constructed with a tri-metal copper-based material for performance.
This is a +0.25mm undersize bearing set for specific engine applications.
Designed for Subaru EJ20, EJ22, and EJ25 engines.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

Built with a tri-metal copper-based material, this main bearing set from King Engine Bearings is designed for performance applications. Specifically, the #3 position main bearings are sized +0.25mm, meaning they are a quarter millimeter larger than standard size. This is important when rebuilding or modifying engines where clearances might have opened up or need to be set precisely.

King uses their PMaxBlack overlay, which helps handle higher loads, and Radialock grooves to ensure the optimal amount of crush height. This combination helps these bearings perform well in demanding situations, like those found in Subaru WRX, STI, Forester, Legacy, and other EJ-series engines. They are a solid option for anyone rebuilding or tuning these popular Subaru platforms.

This set is intended for specific engine builds and sizes. Always refer to your engine's service manual for proper installation procedures and torque specifications.