What does '.25mm oversized' mean for these rod bearings?

This means the bearings are manufactured to be slightly larger than standard size. They are intended for use when the engine's crankshaft journals have been machined down by 0.25mm to ensure a precise fit and proper oil clearance.

Are these bearings suitable for a stock engine rebuild?

These are ACL's Race Series bearings, designed with a specialized overlay for higher loads and temperatures. While they can be used in a stock rebuild if the crankshaft has been machined to the correct undersize, they are primarily intended for performance applications where the engine will be pushed harder than stock.

What is the typical lifespan of these bearings?

The lifespan of engine bearings depends heavily on proper installation, oil quality and maintenance, and the specific operating conditions of the engine. ACL's Race Series bearings are well-built for demanding use, but performance engines often have shorter service intervals due to higher stress.

ACL Ford 4 2.0L Duratec .25mm Oversized Race Series Rod Bearing Set

Specifications

Brand: ACL
Part #: 4B4390H-.25
UPC: 9315726261125

ACL Ford 4 2.0L Duratec .25mm Oversized Race Series Rod Bearing Set

Name: ACL Ford 4 2.0L Duratec .25mm Oversized Race Series Rod Bearing Set
Brand: ACL
SKU: acl-acl-ford-4-2-0l-duratec-25mm-oversized-race-series-rod-bearing-set-t14-45362
Price: 49.64 USD
Availability: BackOrder

$49.64

On Backorder — Expected to ship by May 8, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2004-2013 Mazda 3. ACL .25mm oversized rod bearings for your 2.0L Duratec engine. Built for high-performance applications.

Key Features

Fits 2004-2013 Mazda 3 and 2005-2006 Ford Focus.
These are .25mm oversized rod bearings, intended for use with a crankshaft machined to a 0.25mm undersize.
ACL's Race Series bearings feature a specialized overlay material for improved load capacity and durability.
Designed for high-performance 2.0L Duratec engines.

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Fits these vehicles

Ford Focus 2005-2006
Mazda 3 2004-2013

Product Details

When you're building or rebuilding a performance engine, especially one with the 2.0L Duratec, you need parts that can handle the extra stress. These ACL Race Series rod bearings are a solid choice for that kind of work. They're built with a special overlay material that's designed to withstand higher loads and temperatures than standard bearings, which is crucial when you're pushing an engine harder than stock.

What sets these apart is that they're .25mm oversized. This means they're meant to be used when the crankshaft journals have been machined down by 0.25mm to clean them up or account for wear. Using an oversized bearing ensures a proper, tight fit on the machined crank, which is essential for maintaining oil pressure and preventing premature wear. ACL has been making bearings for a long time, and this Race Series is their go-to for applications where reliability under demanding conditions is key.

If you're in the middle of a performance build or a serious engine overhaul on your Mazda 3 or Ford Focus, these bearings are a critical component. Make sure your crankshaft journals have been measured and machined to the correct 0.25mm undersize before installing these to ensure they perform as intended.