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

This means the bearings are manufactured to be 0.020 inches smaller in diameter than standard. They are intended for use when the crankshaft journals have been machined down by 0.020 inches during an engine rebuild to ensure proper clearance.

What is the main benefit of King Engine Bearings' overlay material?

King Engine Bearings uses a high-performance overlay material that is built for durability and reduced friction. This is important for main bearings as they support the rotating crankshaft and need to withstand significant stress while minimizing wear.

Are these bearings suitable for a stock engine rebuild?

These bearings are 0.020 inches undersize, so they are specifically for engines where the crankshaft journals have been machined down by that amount. If your crankshaft journals are still at standard size, you would need a standard size bearing set.

Specifications

Brand: King Engine Bearings
Part #: MB443SI020
UPC: 611500627125

King Engine Bearings Buick/Pontiac/Oldsmobile V6 Main Bearing Set

Name: King Engine Bearings Buick/Pontiac/Oldsmobile V6 Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-buick-pontiac-oldsmobile-v6-main-beari-t14-432398
Price: 64.96 USD
Availability: BackOrder

$64.96

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 V6 Main Bearing Set. This set is 0.020 inches undersize for a precise fit during engine rebuilds.

Key Features

This set is 0.020 inches undersize for use with machined crankshaft journals.
Features King's high-performance overlay material for durability and reduced friction.
Designed for Buick, Pontiac, and Oldsmobile V6 engines.
Supports the crankshaft and helps maintain oil pressure during engine operation.

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About this part

Product Details

These main bearings are 0.020 inches undersize, meaning they are designed to be used when the crankshaft journals have been machined down by 0.020 inches during an engine rebuild. King Engine Bearings uses a high-performance overlay material that's built for durability and reduced friction, which is crucial for the main bearings that support the crankshaft. This set is specifically made for Buick, Pontiac, and Oldsmobile V6 engines, ensuring a proper fit when you're rebuilding the bottom end of your motor.

When you're rebuilding an engine, getting the bearing clearances just right is critical for oil pressure and longevity. Using bearings that are the correct size for your machined crankshaft journals helps maintain optimal oil film thickness. King's design focuses on providing a solid foundation for your crankshaft, helping to reduce wear and ensure smooth operation.