What is the material of these main bearings?

These main bearings are made from a bimetal material with an aluminum silicon base. This is a well-built material commonly used in engine bearings for its wear resistance and ability to conform to the crankshaft.

What is the function of main bearings in an engine?

Main bearings are crucial components that support the crankshaft within the engine block. They allow the crankshaft to rotate smoothly while maintaining its proper position, which is essential for the engine's overall operation.

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Specifications

Brand: King Engine Bearings
Part #: MB5531SI0.5
UPC: 611500466007

King Engine Bearings Chevrolet 121 (Size +0.50mm) Main Bearing Set

Name: King Engine Bearings Chevrolet 121 (Size +0.50mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-chevrolet-121-size-0-50mm-main-bearing-t14-770793
Price: 68.79 USD
Availability: BackOrder

$68.79

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King Engine Bearings Main Bearing Set MB5531SI0.5 for Chevrolet 121. This is a +0.50mm undersize set.

Key Features

This is a main bearing set for Chevrolet 121 engines.
The set is sized at +0.50mm, intended for use with a machined crankshaft.
Bearings are constructed from a bimetal aluminum silicon base material.
Supports the crankshaft for smooth operation and proper alignment.

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About this part

Product Details

If you're rebuilding the bottom end of your Chevrolet 121 engine, this King Engine Bearings Main Bearing Set (part number MB5531SI0.5) is a solid option. These are main bearings, which support the crankshaft within the engine block, ensuring it spins smoothly and stays properly aligned.

This particular set is sized at +0.50mm, meaning it's designed to be used when the crankshaft journals have been machined down by 0.50mm to clean up wear or damage. The bearings themselves are constructed from a bimetal material with an aluminum silicon base, a common and well-built material for modern engine bearings that offers good wear resistance and conformability to the crankshaft.

When installing these bearings, always refer to the manufacturer's service manual for proper torque specifications and assembly procedures. Ensuring the crankshaft and block surfaces are clean and free of debris is critical for bearing longevity.