What does 'O/S .040in' mean for these bearings?

O/S stands for 'oversize,' and .040in means these bearings are 0.040 inches larger in diameter than standard. This indicates they are designed to fit a crankshaft that has been machined down by 0.040 inches during an engine rebuild.

What is the Tri-M+ babbit overlay?

The Tri-M+ overlay is an advanced layer applied to the bearing surface. It's designed to enhance durability and performance, especially in medium-load engine conditions, by providing a more resilient contact surface.

Are these bearings suitable for high-performance or racing engines?

These bearings are described as ideal for medium-load engines. While they are well-built, for extreme high-performance or racing applications, you might need to consult King Engine Bearings' specialized racing lines to ensure they meet the demands of your specific build.

King Engine Bearings Ford 391CI 32V Turbo V8 Power Stroke/ O/S .040in Main Bearing Set

Specifications

Brand: King Engine Bearings
Part #: MB5816CP
UPC: 611500599613

King Engine Bearings Ford 391CI 32V Turbo V8 Power Stroke/ O/S .040in Main Bearing Set

Name: King Engine Bearings Ford 391CI 32V Turbo V8 Power Stroke/ O/S .040in Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-ford-391ci-32v-turbo-v8-power-stroke-o-t14-432529
Price: 151.05 USD
Availability: BackOrder

$151.05

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Fits 2004-2010 Ford E-350 Super Duty. King Engine Bearings main bearing set, 0.040 inch undersize. Built with tri-metal copper-based material for medium-load engines.

Key Features

Fits 2004-2010 Ford E-350 Super Duty, 2004-2005 Ford E-350 Club Wagon, 2004-2005 Ford Excursion, 2004-2010 Ford F-250 Super Duty, and 2004-2010 Ford F-350 Super Duty.
This is a main bearing set for Ford 391ci 32V Turbo V8 Power Stroke engines.
The bearings are 0.040 inch undersize, intended for use with a machined crankshaft.
Constructed with a tri-metal copper-based material.
Features a Tri-M+ enhanced babbit overlay for improved performance.
Designed for medium-load engine applications.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Product Details

When you're rebuilding the bottom end of your Ford 391ci 32V Power Stroke, getting the right main bearings is crucial. This set from King Engine Bearings is specifically made for your Turbo V8 engine and comes ready to install at 0.040 inches undersize. King has been specializing in bearings since 1960, focusing on making them the best available.

This set uses a tri-metal copper-based material with their Tri-M+ enhanced babbit overlay. This construction is ideal for medium-load engines, offering solid performance and durability for your rebuild. Because these are undersize bearings, they are intended to be used with a crankshaft that has been machined down by 0.040 inches to ensure a proper fit and oil clearance.