What is the main purpose of main bearings?

Main bearings support the crankshaft within the engine block. They create a low-friction surface for the crankshaft to rotate on, while also maintaining the correct oil clearance for proper lubrication and engine operation.

What does 'Standard Size' mean for these bearings?

Standard size means these bearings are meant to be installed on a crankshaft and in an engine block that have not been machined or modified from their original factory specifications. If your crankshaft has been ground undersize, you would need a different bearing size.

Are these bearings suitable for high-performance or racing engines?

These bearings are ideal for medium-load engines. For extreme high-performance or racing applications that experience significantly higher loads and RPMs, a different bearing material or design might be more appropriate.

Specifications

Brand: King Engine Bearings
Part #: MB5293SI
UPC: 611500412967

King GM 294/325/345/364CI 4.8/5.3/5.7/6.0L L20/LS1/LS2/LS4/LS6 Main Bearing Set - Size STD

Name: King GM 294/325/345/364CI 4.8/5.3/5.7/6.0L L20/LS1/LS2/LS4/LS6 Main Bearing Set - Size STD
Brand: King Engine Bearings
SKU: king-engine-bearings-king-gm-294-325-345-364ci-4-8-5-3-5-7-6-0l-l20-ls1-ls2-ls4--t14-4321113
Price: 58.97 USD
Availability: InStock

$58.97

In Stock

King Engine Bearings main bearing set for GM Vortec/LS-series engines. Standard size. Built with lead-free composite.

Key Features

Fits 66+ vehicle make/model combinations.
Standard size main bearing set.
Constructed with a bi-metal aluminum material.
Features a lead-free composite surface.
Ideal for medium-load engines.
Designed for GM Vortec and LS-series Gen III IV engines.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

These main bearings are made from a lead-free composite on a bi-metal aluminum base, making them a solid option for medium-load GM engines. King Engine Bearings has been specializing in this exact type of component since 1960, focusing on supplying well-built bearings for the marketplace. This set is designed for a range of GM Vortec and LS-series engines, including popular applications like the Chevrolet Silverado, Tahoe, and Corvette.

The bi-metal aluminum construction offers good strength and wear resistance, while the lead-free composite material is environmentally safe and suitable for engines that don't demand the absolute highest load capacity. This standard size set is a direct replacement for your worn-out bearings, helping to restore proper crankshaft support and oil clearance. King's focus on specialization means you're getting a part built with a deep understanding of bearing technology.