What does the 0.25mm undersize mean for my engine build?

The 0.25mm undersize indicates that these bearings are designed for crankshaft journals that have been machined down by 0.25mm. This is common when rebuilding an engine with worn or damaged crankshaft journals that have been ground to a specific undersize.

What is the tri-metal construction and why is it important?

Tri-metal bearings use three distinct layers of material to provide optimal performance. This construction balances hardness for wear resistance, embeddability to absorb small debris, and conformability to adapt to the crankshaft journal for a consistent oil film.

Does this main bearing set come with all the necessary hardware for installation?

This listing is for the main bearing set only. It includes the bearings themselves, but typically does not include installation hardware like main cap bolts or oil. Always refer to the manufacturer's instructions for a complete list of required components.

King Engine Bearings Main Bearing Set MB5363SI0.25

Name: King Engine Bearings General Motors 379/395 (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-general-motors-379-395-size-0-25mm-mai-t14-770667
Price: 74.82 USD
Availability: BackOrder

King Engine Bearings General Motors 379/395 (Size +0.25mm) Main Bearing Set

$74.82

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

King Engine Bearings General Motors 379/395 (Size +0.25mm) Main Bearing Set

Key Features

Fits General Motors 379/395 engines.
Main bearing set is 0.25mm undersize.
Constructed with a tri-metal material for durability and performance.
Features King's unique overlay technology for added protection.

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Product Details

These King Engine Bearings are built with a tri-metal material that offers a strong, well-built surface for your crankshaft mains. They are specifically sized at 0.25mm undersize, which is important when you're rebuilding an engine and need to account for crankshaft journal wear or have had the journals ground down to this size. This set is designed for General Motors 379/395 applications, ensuring a proper fit for those specific engine blocks.

The tri-metal construction is key here. It's a layered material that balances hardness, embeddability, and conformability, which helps these bearings handle the heavy loads and high speeds found in an engine. This means they can better absorb contaminants without scoring the crankshaft and can conform to slight imperfections in the journal surface for a better oil film. King uses a unique overlay technology that adds an extra layer of protection, helping to extend the life of both the bearing and your crankshaft.

When you're putting an engine back together, getting the bearings right is crucial for long-term reliability. This set is a solid option for a rebuild where you need dependable main bearings that can handle the demands of a General Motors 379/395 engine.