What does the 'O/S .040in (Size 0.25)' designation mean for these bearings?

This indicates that the bearings are machined 0.040 inches undersize compared to a standard size bearing. This is a common practice in engine rebuilding to achieve proper oil clearance when crankshaft journals have been machined down.

What is the Tri-M+ enhanced babbit overlay?

The Tri-M+ overlay is a specific babbit layer applied to the bearing surface. It's designed to enhance the bearing's ability to withstand load and reduce friction, contributing to improved engine durability and performance.

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

These bearings are specified for medium-load engines. For high-performance or racing applications, it's always best to consult the manufacturer's specific recommendations for those types of builds.

King Engine Bearings Ford 391CI 32V Turbo V8 Power Stroke/ O/S .040in (Size 0.25) Main Bearing Set

Specifications

Brand: King Engine Bearings
Part #: MB5816CP0.25
UPC: 611500599620

King Engine Bearings Ford 391CI 32V Turbo V8 Power Stroke/ O/S .040in (Size 0.25) Main Bearing Set

Name: King Engine Bearings Ford 391CI 32V Turbo V8 Power Stroke/ O/S .040in (Size 0.25) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-ford-391ci-32v-turbo-v8-power-stroke-o-t14-432530
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.

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.
Main bearing set is machined 0.040 inch undersize for specific engine builds.
Constructed with a tri-metal copper-based material for strength.
Features a Tri-M+ enhanced babbit overlay for improved performance.
Designed for medium-load engines, offering reliable operation.
From King Engine Bearings, a specialist in engine bearing manufacturing since 1960.

⚠️ 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

Built with a tri-metal copper-based material and an enhanced babbit overlay, this main bearing set from King Engine Bearings is a solid option for your 391CI 32V Turbo V8 Power Stroke engine. These bearings are specifically designed for medium-load applications, offering reliable performance where it counts. This set is machined 0.040 inches undersize, which is important to note for proper installation and engine assembly.

King Engine Bearings has been specializing in bearing technology since 1960, focusing on supplying well-built engine bearings. This particular set utilizes their Tri-M+ enhanced babbit overlay, a design choice that helps improve durability and performance in engines that see regular use. When rebuilding or repairing your engine, using bearings that are precisely sized and constructed from quality materials is key to ensuring longevity and proper oil clearance.

This main bearing set is designed to fit a range of Ford Super Duty trucks and vans from 2004 through 2010, including the E-350 Super Duty, F-250 Super Duty, and F-350 Super Duty, as well as the Excursion and E-350 Club Wagon. Ensure you have the correct undersize measurement for your specific engine build before installation.