What does '0.020 inch undersize' mean for these bearings?

This means the inner diameter of the bearing is 0.020 inches smaller than a standard, factory-size bearing. This is necessary when the crankshaft journals have been machined down to this specific size to clean them up.

Are these bearings suitable for a stock, unmachined crankshaft?

No, these bearings are specifically intended for use with a crankshaft that has had its main journals machined down to be 0.020 inch undersize. Using them on a standard-size crankshaft will result in incorrect oil clearance.

What is the typical application for this type of bearing?

These bearings are typically used during an engine rebuild where the crankshaft has been resurfaced or machined. They ensure proper oil clearance is maintained between the crankshaft and the engine block's main journals.

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Specifications

Brand: King Engine Bearings
Part #: MB5875SI020
UPC: 611500626517

King Engine Bearings GM Vortex / Gen III LS-Series Main Bearing Set

Name: King Engine Bearings GM Vortex / Gen III LS-Series Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-gm-vortex-gen-iii-ls-series-main-beari-t14-888573
Price: 96.97 USD
Availability: InStock

$96.97

Only 1 left in stock

King Engine Bearings LS Main Bearing Set MB5875SI020. These main bearings are 0.020 inch undersize for a precise fit during engine rebuilds.

Key Features

Main bearing set for GM Vortex and Gen III LS-Series engines.
Main bearings are 0.020 inch undersize for use with machined crankshafts.
Designed as a direct replacement for stock main bearings.

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About this part

Product Details

If you're rebuilding the bottom end of your GM Vortex or Gen III LS-Series engine, getting the main bearings right is crucial for long-term reliability. This set from King Engine Bearings is designed to be a direct replacement for your stock bearings, but with an important difference: they are 0.020 inch undersize.

This undersize sizing is common when the crankshaft journals have been machined down to clean up any imperfections or wear. Using bearings that match the machined journal size ensures proper oil clearance, which is vital for lubricating the rotating assembly and preventing premature wear. King Engine Bearings are well-built with materials chosen for durability and consistent performance under the stresses of an engine.

When you're putting an engine back together, especially after machine work, having the correct size bearings is key. This set is ready to go in once your crankshaft journals are prepped to the 0.020 inch undersize specification.