What is the STDX size designation?

The STDX size designation means these bearings are 0.001 inch undersize. This is a common size used when an engine block or crankshaft has been machined to achieve precise bearing clearances.

What is the pMax Black trimetal material?

King's pMax Black trimetal is a race-oriented bearing material designed for high load capacity and improved durability. It's a step up from standard bearings for performance engine builds.

Are these bearings suitable for a stock rebuild?

While these are race bearings, they can be used in a stock rebuild if the engine has been properly machined to the STDX size. For a standard rebuild without performance modifications, a different bearing might be considered.

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Specifications

Brand: King Engine Bearings
Part #: MB7039XPSTDX
UPC: 611500542756

King Engine Bearings BMW M20/M50 2.0L/2.5L/2.7L Performance Main Bearing Set - Size STDX

Name: King Engine Bearings BMW M20/M50 2.0L/2.5L/2.7L Performance Main Bearing Set - Size STDX
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-m20-m50-2-0l-2-5l-2-7l-performance-t14-4339651
Price: 148.93 USD
Availability: InStock

$148.93

In Stock

King Engine Bearings main bearing set for BMW M20/M50 engines. Size STDX, pMax Black trimetal race bearings.

Key Features

Fits BMW M20, M50 2.0L, 2.5L, and 2.7L engines.
This is a main bearing set.
Features King's pMax Black trimetal race bearing material.
Size STDX indicates a 0.001 inch undersize for machining.
Designed for performance applications.

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About this part

Product Details

This is a set of King Engine Bearings main bearings, specifically the MB7039XPSTDX model. You get the main bearings needed for an engine rebuild. These are race bearings featuring King's pMax Black trimetal material, designed for demanding applications where improved performance is key.

These bearings are built with a trimetal construction that offers excellent load-carrying capacity and durability. The STDX size indicates they are 0.001 inch undersize, which is a common size for engine machining to achieve proper clearances. They are intended for BMW M20 and M50 engines with displacements of 2.0L, 2.5L, and 2.7L, covering a wide range of popular BMW models from the 1980s through the early 2000s.