What does the +0.50mm sizing mean for this bearing set?

The +0.50mm sizing indicates that these bearings are intended for use when the engine's crankshaft has been machined down by 0.50mm. This is a common practice during engine rebuilds to ensure proper oil clearance with worn or resurfaced journals.

What is the bimetal aluminum silicon base construction?

This construction uses a combination of aluminum and silicon, bonded to a steel backing. It's a popular choice for main bearings because it offers good wear resistance and the ability to conform to the crankshaft surface for optimal oil flow.

Are these bearings a direct replacement for all General Motors 379 V8 OHV engines?

These bearings are a direct replacement for General Motors 379 V8 OHV engines that require a +0.50mm main bearing size. Always confirm your engine's specific bearing size requirements before purchasing.

Specifications

Brand: King Engine Bearings
Part #: MB5257SI1.5
UPC: 611500435638

King Engine Bearings General Motors 379/V8 Ohv (Size +0.50mm) Main Bearing Set

Name: King Engine Bearings General Motors 379/V8 Ohv (Size +0.50mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-general-motors-379-v8-ohv-size-0-50mm--t14-770604
Price: 74.61 USD
Availability: BackOrder

$74.61

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King Engine Bearings Main Bearing Set MB5257SI1.5. Features a bimetal aluminum silicon base for General Motors 379/V8 OHV engines.

Key Features

Fits AM General Hummer, Chevrolet, and GMC vehicles with 379 V8 OHV engines.
Main bearing set is sized +0.50mm for use with machined crankshafts.
Constructed with a bimetal aluminum silicon base for durability.
Designed to maintain proper oil clearance and reduce friction in the engine.

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About this part

Product Details

Built with a bimetal aluminum silicon base, this King Engine Bearings Main Bearing Set is designed for General Motors 379 V8 OHV engines. This specific set is sized +0.50mm, meaning it's intended for crankshafts that have been machined down by 0.50mm during an engine rebuild. These bearings are crucial for maintaining the correct oil clearance between the crankshaft and the engine block, ensuring proper lubrication and reducing friction.

King Engine Bearings uses a bimetal construction, which is a common and well-tested approach for main bearings. This type of bearing offers a good balance of strength and conformability, allowing it to adapt to minor imperfections in the crankshaft journal while still providing solid support. This set fits a wide range of vehicles, including models like the AM General Hummer, Chevrolet C1500, and GMC Sierra, making it a versatile option for many GM V8 applications.

When rebuilding an engine, using bearings that are precisely sized for the machined crankshaft is essential for oil pressure and engine longevity. This +0.50mm set is a direct replacement for applications where that specific machining has been performed.