What does '+0.030' mean for these bearings?

The '+0.030' indicates that these bearings are 0.030 inches larger in diameter than standard size. This is used when the crankshaft journals have been machined down (ground undersize) due to wear or damage during an engine rebuild.

What is the tri-metal overlay construction?

Tri-metal bearings have three layers: a steel backing for strength, a middle layer of aluminum alloy for heat dissipation and conformability, and a top layer of babbitt (a soft alloy) for excellent embeddability and reduced friction against the crankshaft.

Are these bearings suitable for a stock rebuild?

While these bearings offer improved performance, their +0.030 sizing means they are specifically for engines where the crankshaft has been machined to that undersize. Always confirm your crankshaft journal dimensions before ordering.

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Specifications

Brand: King Engine Bearings
Part #: MB638CP030
UPC: 611500621635

King Engine Bearings General Motors L52 Vortec 3.5L (Size +0.030) Main Bearing Set

Name: King Engine Bearings General Motors L52 Vortec 3.5L (Size +0.030) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-general-motors-l52-vortec-3-5l-size-0--t14-432583
Price: 189.99 USD
Availability: BackOrder

$189.99

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King Engine Bearings Main Bearing Set for General Motors L52 Vortec 3.5L. Undersize +0.030.

Key Features

This is a +0.030 inch undersize main bearing set.
Features a tri-metal overlay for improved performance and durability.
Designed for General Motors L52 Vortec 3.5L engines.
King Engine Bearings is a well-known name in engine bearings.

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About this part

Product Details

These main bearings are built with a tri-metal overlay, a common choice for performance and durability in demanding engine builds. This specific set is sized +0.030 inches, meaning it's designed to compensate for wear on the crankshaft journals during an engine rebuild. They are intended for General Motors L52 Vortec 3.5L engines.

King Engine Bearings uses a specialized manufacturing process to create their bearings. The tri-metal construction offers a good balance of strength and conformability, helping to maintain oil film thickness under various load conditions. This set is a solid option when you're rebuilding the bottom end of your L52 Vortec engine and need to ensure proper clearances and oil pressure.