What does the '040' size designation mean for these bearings?

The '040' in the part number indicates that these bearings are 0.040 inches undersize. This means they are intended for use with a crankshaft that has been machined down by 0.040 inches to match this bearing size. This is common when rebuilding an engine with worn or damaged crankshaft journals.

What is the advantage of a bimetal aluminum base bearing?

Bimetal bearings, often with an aluminum alloy base, offer a good balance of strength, conformability, and embeddability. This construction is well-suited for the high loads and temperatures found in main bearing applications, providing reliable performance and durability.

Are any other parts needed when installing these main bearings?

When installing main bearings, it is essential to have the crankshaft professionally machined to the correct undersize (0.040 inches in this case). You will also need new main bearing cap bolts or studs, assembly lubricant, and potentially new oil seals and gaskets for a complete engine rebuild.

King Engine Bearings Ford V8 351ci 5.8L 16V Crankshaft Main Bearings (Size 040) - Set of 5

Specifications

Brand: King Engine Bearings
Part #: MB5503AM 040
UPC: 611500195051

King Engine Bearings Ford V8 351ci 5.8L 16V Crankshaft Main Bearings (Size 040) - Set of 5

Name: King Engine Bearings Ford V8 351ci 5.8L 16V Crankshaft Main Bearings (Size 040) - Set of 5
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-ford-v8-351ci-5-8l-16v-crankshaft-main-t14-850645
Price: 70.45 USD
Availability: BackOrder

$70.45

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King Engine Bearings Ford V8 351ci 5.8L 16V Crankshaft Main Bearings (Size 040) - Set of 5. Features a bimetal aluminum base.

Key Features

Fits 21+ vehicle make/model combinations.
Crankshaft main bearing set.
Sized 0.040 inches undersize.
Features a bimetal construction with an aluminum base.
Designed for Ford V8 351ci 5.8L 16V engines.

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Will this fit your vehicle?

Product Details

This product is a set of five crankshaft main bearings from King Engine Bearings, specifically sized 0.040 inches undersize. These bearings feature a bimetal construction with an aluminum base, designed for Ford V8 351 cubic inch (5.8L) 16-valve engines. They are intended for use in engine rebuilding applications where the crankshaft journals have been machined undersize to correct wear or runout.

The bimetal construction is a common and well-built design for main bearings, offering good load-carrying capacity and durability. The aluminum base provides a solid foundation for the bearing surface, which is crucial for handling the significant forces generated by a V8 crankshaft. Because these bearings are specifically sized at 0.040 inches undersize, they are meant to be paired with a crankshaft that has been machined to match this dimension. This ensures a proper oil clearance and a snug fit for optimal performance and longevity.

This set fits a wide range of Ford and Mercury vehicles from the late 1960s through the mid-1970s, including popular models like the Ford Mustang, Torino, and Mercury Cougar. Always confirm fitment for your specific vehicle and ensure your crankshaft has been machined to the 0.040 inch undersize specification before ordering.