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

This means the inside diameter of the bearings is 0.25mm smaller than the standard size. This is necessary when the crankshaft journals have been machined down to this specific size during an engine rebuild to correct wear or out-of-round conditions.

What is the 'Cobra' material mentioned for these bearings?

The 'Cobra' material is King Engine Bearings' high-performance overlay. It's designed to offer good embeddability, meaning it can conform to minor imperfections, and provides excellent wear resistance to protect your crankshaft journals.

Do these bearings come with installation instructions?

While specific installation instructions are not included with this product listing, it is highly recommended to refer to the official King Engine Bearings installation guide or a professional service manual for your Ford Ecoboost 2.7L V6 engine. Proper installation is critical for engine longevity.

Specifications

Brand: King Engine Bearings
Part #: MB4558MC0.25
UPC: 611500620799

King Engine Bearings Ford Ecoboost 2.7L V6 (Size 0.25) Main Bearing Set

Name: King Engine Bearings Ford Ecoboost 2.7L V6 (Size 0.25) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-ford-ecoboost-2-7l-v6-size-0-25-main-b-t14-432421
Price: 74.65 USD
Availability: BackOrder

$74.65

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King Engine Bearings Main Bearing Set MB4558MC0.25 for Ford Ecoboost 2.7L V6. This set is 0.25mm undersize.

Key Features

This is a King Engine Bearings Main Bearing Set, part number MB4558MC0.25.
Designed for Ford Ecoboost 2.7L V6 engines.
This set is machined 0.25mm undersize for use with a reconditioned crankshaft.
Features King's 'Cobra' material overlay for improved wear resistance and embeddability.
Helps ensure smooth crankshaft rotation and protects journal surfaces.

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About this part

Product Details

This is a King Engine Bearings Main Bearing Set, part number MB4558MC0.25, specifically for Ford Ecoboost 2.7L V6 engines. These bearings are crucial for the proper function of your engine's crankshaft, allowing it to spin smoothly within the engine block. This particular set is machined 0.25mm undersize, which is important if your crankshaft journals have been machined to match this size during an engine rebuild.

King Engine Bearings is known for making well-built engine components. This main bearing set uses their 'Cobra' material, which is a high-performance overlay material designed to handle the stresses of modern engines. The overlay provides good embeddability and conformability, helping to protect the crankshaft journals from wear, especially under demanding conditions. Installing these bearings correctly is key to ensuring long-term engine health and performance after a rebuild.