What does the '0.25mm undersize' mean for these bearings?

This means the bearings are manufactured to be 0.25 millimeters smaller in diameter than standard size. This is necessary when the crankshaft journals have been machined down (ground undersize) during an engine rebuild to remove imperfections or to achieve specific clearances.

Are these bearings suitable for a stock engine rebuild?

While these are ACL Race Series bearings, they can be used in a stock rebuild if the crankshaft journals are in excellent condition and measure to the standard size. However, they are particularly well-suited for engines that see higher performance demands or are being rebuilt for heavy-duty use.

What is the difference between standard and undersize bearings?

Standard bearings are made to the original factory specifications for a new crankshaft. Undersize bearings are made slightly smaller to compensate for crankshaft journals that have been machined down due to wear or to achieve a specific, tighter oil clearance.

ACL Ford Prod. V8 4.6/5.4L Race Series Engine Crankshaft Main Bearing Set

Specifications

Brand: ACL
Part #: 5M7296H-.25

ACL Ford Prod. V8 4.6/5.4L Race Series Engine Crankshaft Main Bearing Set

Name: ACL Ford Prod. V8 4.6/5.4L Race Series Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-ford-prod-v8-4-6-5-4l-race-series-engine-crankshaft-main-bearing-set-t14-631190
Price: 149.94 USD
Availability: BackOrder

$149.94

On Backorder

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

Fits 2005 Ford F-150. ACL Race Series main bearing set for V8 4.6/5.4L engines. Undersize 0.25mm.

Key Features

Fits 2005 Ford F-150.
ACL Race Series main bearing set for V8 4.6L and 5.4L engines.
Bearings are 0.25mm undersize for use with machined crankshaft journals.
Features a high-performance overlay system for demanding use.
Constructed with a hardened steel back for added strength.

Secure CheckoutFast Shipping631-982-0042

Fits this vehicle

Ford F-150 2005

Product Details

When you're rebuilding a Ford F-150 V8 with the 4.6L or 5.4L engine, especially for performance applications, the crankshaft main bearings are critical. This ACL Race Series set is built for demanding use, offering a solid foundation for your engine's rotating assembly. These bearings are manufactured to tight tolerances, ensuring proper oil clearance for your crankshaft.

The Race Series designation means these bearings are made with a high-performance overlay system and a hardened steel back. This construction helps them handle the increased loads and heat that can come with performance tuning or heavy-duty operation. This particular set is 0.25mm undersize, which is important if your crankshaft journals have been machined to match this size during an engine rebuild. Using the correct undersize bearing is crucial for achieving the proper oil clearance and ensuring the longevity of your engine.

For a successful engine rebuild, always refer to your vehicle's service manual for the correct installation procedures and torque specifications. Make sure your crankshaft journals are clean and measured accurately before installing these bearings.