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

This means the bearings are manufactured to be 0.25mm smaller in diameter than standard size. They are intended for use when the crankshaft journals have been machined down by 0.25mm to correct wear or achieve a specific bearing clearance.

What is the King HP Series line?

The HP Series is King Engine Bearings' performance line, featuring advanced materials and designs like a specialized overlay and micro-babbitt surface. These are engineered for racing and high-stress applications where friction reduction and durability are critical.

Do these bearings come with installation instructions?

While specific installation instructions are not included with this product listing, it is highly recommended to consult the manufacturer's official installation guidelines or a professional mechanic. Proper installation, especially with machined crankshafts, is crucial for performance and longevity.

Specifications

Brand: King Engine Bearings
Part #: MB5283HP0.25
UPC: 611500466991

King Engine Bearings Performance Main Bearing Set - Size 0.25

Name: King Engine Bearings Performance Main Bearing Set - Size 0.25
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-performance-main-bearing-set-size-0-25-t14-4317736
Price: 138.48 USD
Availability: BackOrder

$138.48

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King Engine Bearings HP Series main bearing set. Size 0.25mm undersize. For Ford 4.6L V8 engines.

Key Features

Fits a wide range of Ford, Lincoln, and Mercury vehicles with 4.6L V8 engines.
This is a 0.25mm undersize main bearing set, intended for machined crankshafts.
Features King's HP Series design with a specialized overlay and micro-babbitt surface.
Designed for performance applications requiring improved lubrication and durability.
Includes main bearings for Ford 4.6L DOHC and SOHC 24-valve V8 engines.

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About this part

Product Details

This is a King Engine Bearings HP Series main bearing set, specifically sized at 0.25mm undersize. These bearings are designed for Ford 4.6L V8 engines, covering both DOHC and SOHC 24-valve configurations. They are part of King's racing line, intended for performance applications where improved lubrication and durability are key.

The HP Series bearings feature a specialized overlay material and a unique micro-babbitt surface that work together to reduce friction and wear, especially under high-stress conditions. This particular set is 0.25mm undersize, meaning it's meant for crankshafts that have been machined down by that amount to correct for wear or to achieve a specific clearance. Proper installation with the correct machining is crucial for these bearings to perform as intended.

This set fits a wide range of Ford, Lincoln, and Mercury vehicles from the mid-90s through the early 2010s, including popular models like the Ford Mustang, Expedition, and F-150. Ensure your crankshaft has been machined to a 0.25mm undersize before installing these bearings for optimal performance and longevity.