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

The +0.25mm sizing indicates that these bearings are intended for use when the crankshaft journals have been machined down by 0.25mm. This is a common practice during engine rebuilding to ensure proper clearances with worn or resurfaced crankshafts.

What is PMaxBlack and Radialock technology?

PMaxBlack is a specialized overlay that helps these bearings handle superior load capacity. Radialock technology is designed to maintain optimal crush height, ensuring the bearing stays securely in place within the engine block.

Are these bearings suitable for a performance build?

The tri-metal copper-based material and PMaxBlack overlay offer improved load capacity and thermal properties, making them a well-built option for many applications, including those that may see more demanding use than stock.

Specifications

Brand: King Engine Bearings
Part #: MB5304XP0.25
UPC: 611500542961

King Engine Bearings Mazda B6/B6-T/ZM/B3/B5 Main Bearing Set - Size +0.25mm

Name: King Engine Bearings Mazda B6/B6-T/ZM/B3/B5 Main Bearing Set - Size +0.25mm
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-mazda-b6-b6-t-zm-b3-b5-main-bearing-se-t14-4326089
Price: 109.06 USD
Availability: InStock

$109.06

In Stock

King Engine Bearings main bearing set for Mazda B6/B6-T/ZM/B3/B5 engines. Size +0.25mm. Improves load capacity and crush height.

Key Features

Fits a wide range of vehicles including Mazda, Ford, Kia, and Mercury models.
Main bearing set is sized +0.25mm for use with machined crankshaft journals.
Features PMaxBlack overlay for improved load capacity.
Incorporates Radialock technology for optimal crush height and secure fit.
Constructed with a tri-metal copper-based material for good thermal and wear properties.

⚠️ 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

If you're rebuilding the bottom end of your Mazda B6, B6-T, ZM, B3, or B5 engine, this main bearing set from King Engine Bearings is a solid option. These bearings are specifically sized at +0.25mm, meaning they are intended for use when the crankshaft journals have been machined down by 0.25mm. King has been a specialist in engine bearings since 1960, focusing on supplying well-built components for a wide range of vehicles.

This set features King's PMaxBlack overlay, which helps handle higher loads compared to standard bearings. They also incorporate Radialock technology, designed to maintain optimal crush height during installation for a secure fit. The tri-metal copper-based material offers good thermal conductivity and wear resistance, essential for the demanding environment of the engine's main bearing saddles.

This set fits a variety of vehicles, including popular models like the Mazda Miata, Mazda Protege, and Ford Escort from the 1990s. Always ensure your crankshaft journals have been properly machined to the correct undersize before installing these bearings.