What does '0.010 inch undersize' mean for these bearings?

This means the bearings are manufactured to be 0.010 inches smaller in diameter than a standard bearing. They are intended for use with a crankshaft that has been machined down by 0.010 inches during an engine rebuild.

What is the 'SI' designation in the part number?

The 'SI' in the part number typically refers to a standard chamfer on the bearing edges. This chamfer is important for smooth installation and to ensure proper oil flow around the crankshaft fillets.

What type of material are these bearings made from?

These bearings are made from a tri-metal material. This type of construction is known for offering a good combination of strength to handle loads and conformability to adapt to the crankshaft surface.

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Specifications

Brand: King Engine Bearings
Part #: MB5274SI010
UPC: 611500433023

King Engine Bearings GM 366/396/402/427/502 Main Bearing Set

Name: King Engine Bearings GM 366/396/402/427/502 Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-gm-366-396-402-427-502-main-bearing-se-t14-514905
Price: 154.75 USD
Availability: BackOrder

$154.75

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King Engine Bearings GM 366/396/402/427/502 Main Bearing Set. These bearings are 0.010 inch undersize for a precise fit.

Key Features

Main bearing set for GM 366, 396, 402, 427, and 502 V8 engines.
Bearings are 0.010 inch undersize for use with machined crankshafts.
Constructed with a tri-metal material for durability and load capacity.
Features standard chamfer ('SI') for proper oil flow and installation.

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About this part

Product Details

These King Engine Bearings main bearings are 0.010 inch undersize, meaning they are designed to be used with crankshafts that have been machined down by 0.010 inches. This is a common practice when rebuilding an engine to ensure a fresh, perfectly sized surface for the bearings to run on. This set is specifically made for GM big-block V8 engines like the 366, 396, 402, 427, and 502 cubic inch displacements.

King Engine Bearings uses a specialized tri-metal material for their bearings, which offers a good balance of strength and conformability. This helps them handle the heavy loads and high speeds found in these powerful V8 engines. The 'SI' in the part number indicates a standard chamfer on the bearing edges, which is important for proper oil flow and installation, especially around the crankshaft fillets. This set is a solid option for anyone rebuilding one of these classic GM big-block engines and looking for reliable main bearings.