What does '1.0mm undersize' mean for these bearings?

This means the bearings are manufactured to be 1.0mm smaller in diameter than a standard-sized bearing. They are designed to be used with a crankshaft that has been professionally ground down by 1.0mm to account for wear or damage.

What is the material of these main bearings?

These bearings are made from a bimetal construction, featuring an aluminum silicon base. This material is selected for its durability and ability to handle the stresses of supporting the crankshaft.

Do these bearings come with installation hardware?

This listing is for the main bearing set only. Installation hardware, such as main cap bolts or seals, are typically sold separately and should be replaced during an engine rebuild.

Specifications

Brand: King Engine Bearings
Part #: MB4052SI1.0
UPC: 611500419041

King Engine Bearings Ford 232 (3.8L) (Size +1.0mm) Main Bearing Set

Name: King Engine Bearings Ford 232 (3.8L) (Size +1.0mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-ford-232-3-8l-size-1-0mm-main-bearing--t14-770332
Price: 59.47 USD
Availability: BackOrder

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Fits 1989-1995 Ford Thunderbird. King Engine Bearings Main Bearing Set MB4052SI1.0 is 1.0mm undersize for the 3.8L engine.

Key Features

Fits 1989-1995 Ford Thunderbird and 1989-1990 Mercury Cougar.
Main bearing set for Ford 3.8L (232ci) V6 engines.
This set is 1.0mm undersize, intended for use with a machined crankshaft.
Constructed with a bimetal aluminum silicon base for good wear resistance.
Supports the crankshaft and maintains proper oil clearance within the engine block.

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About this part

Product Details

If you're rebuilding the engine in your 1989-1995 Ford Thunderbird with the 3.8L V6, this King Engine Bearings Main Bearing Set (part number MB4052SI1.0) is what you'll need. These are main bearings, which support the crankshaft within the engine block and allow it to spin smoothly. This set is specifically sized at 1.0mm undersize, meaning it's intended for crankshafts that have been machined down by 1.0mm to correct for wear or damage.

King builds these bearings with a bimetal construction, using an aluminum silicon base. This material is chosen for its good wear characteristics and ability to handle the loads placed on the main bearings. Because these are an undersize bearing, they are designed to be used with a crankshaft that has been professionally ground down to match the bearing's dimensions. Using the correct size bearing is crucial for proper oil clearance, which is essential for engine longevity.