What does 'undersize 0.060in' mean for these bearings?

This means the bearings are manufactured to be 0.060 inches smaller than the standard size. This is necessary when the engine's crankshaft has been machined (ground down) during a rebuild to remove imperfections or to achieve a specific clearance.

What is the construction of these SI-Series main bearings?

These bearings are made with a bimetal construction, utilizing an aluminum silicon base. This material combination is chosen for its wear resistance and ability to work well with different lubrication conditions.

Are these bearings suitable for a stock rebuild?

These bearings are specifically an undersize set (0.060 inches). They are intended for engines where the crankshaft has been machined undersize. For a standard rebuild with an unmachined crankshaft, you would need a standard size bearing set.

Specifications

Brand: King Engine Bearings
Part #: MB556SI060
UPC: 611500441561

King Engine Bearings Chevrolet 396/400/427/502 (Undersize 0.60in) SI-Series Main Bearing Set

Name: King Engine Bearings Chevrolet 396/400/427/502 (Undersize 0.60in) SI-Series Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-chevrolet-396-400-427-502-undersize-0--t14-356434
Price: 44.86 USD
Availability: BackOrder

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King Engine Bearings SI-Series Main Bearing Set for Chevrolet 396-502 engines. 0.060 inch undersize.

Key Features

Fits Chevrolet 396-502 Gen IV, V, and VI engines.
Main bearing set is 0.060 inch undersize for use with a machined crankshaft.
Features a bimetal construction with an aluminum silicon base.
Designed for a wide range of Chevrolet vehicles from the mid-60s to the early 2000s.

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About this part

Product Details

King Engine Bearings is well-known for making solid engine components, and this SI-Series Main Bearing Set is a great example of their work. This set is designed for Chevrolet 396, 400, 427, and 502 cubic inch V8 engines, specifically for Gen IV, V, and VI applications. It's important to note that this is an undersize set, meaning the bearings are 0.060 inches smaller than standard, which is crucial for engines that have had their crankshafts ground down during a rebuild.

These bearings feature a bimetal construction with an aluminum silicon base, offering good wear resistance and compatibility with various oil types. They fit a wide range of Chevrolet vehicles, including popular models like the 1965-1975 Chevrolet Bel Air, 1967-1972 Chevrolet Camaro, and 1965-1974 Chevrolet Corvette, among many others. Using the correct undersize bearings is key to ensuring proper oil clearance and engine longevity after machining work.