What does '.001 undersize' mean for these bearings?

This means the bearings are manufactured to be slightly smaller than the standard size by 0.001 inches. This is necessary when the crankshaft journals have been machined down (ground) during an engine rebuild to remove imperfections or to prepare for undersize bearings.

Are these bearings suitable for a daily driver?

While these are high-performance bearings, they can be used in daily drivers, especially if the engine has been rebuilt or modified. Their advanced construction helps manage heat and friction, which is beneficial for any engine under load.

What is the purpose of the 120-degree oil groove?

The 120-degree oil groove is designed to help maintain a consistent supply of oil to the main bearing surfaces. This improved oil flow is critical for reducing friction and preventing premature wear, especially in high-performance or high-RPM applications.

Specifications

Brand: ACL
Part #: 5M7299H-001
UPC: 9315726461006

ACL Chevy V8 LS Gen III/IV Race Series .001 Oversized High Performance Main Bearing Set

Name: ACL Chevy V8 LS Gen III/IV Race Series .001 Oversized High Performance Main Bearing Set
Brand: ACL
SKU: acl-acl-chevy-v8-ls-gen-iii-iv-race-series-001-oversized-high-performance-main-b-t14-424324
Price: 181.73 USD
Availability: BackOrder

$181.73

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ACL Chevy V8 LS Gen III/IV Race Series .001 Oversized High Performance Main Bearing Set. For GM LS Gen III - IV engines.

Key Features

Fits 61+ vehicle make/model combinations including Buick, Cadillac, Chevrolet, GMC, Pontiac, and Hummer.
ACL Race Series main bearing set for GM LS Gen III and IV V8 engines.
Bearings are .001 inch (0.025mm) undersize for use with ground crankshafts.
Features a 120-degree oil groove for improved oil circulation.
Constructed with a high-performance overlay material for durability.
Designed for high-performance and racing applications.

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About this part

Product Details

This ACL Race Series main bearing set is built for GM LS Gen III and IV V8 engines. These bearings are precision-machined to be 0.001 inches undersize, which is crucial when your crankshaft journals have been ground down during a rebuild. The 120-degree oil groove design helps ensure consistent oil flow to the main bearings, reducing friction and heat buildup under demanding conditions. ACL uses a high-performance overlay material that's well-built to handle the stresses of performance applications.

This set includes all the main bearings needed for a complete engine rebuild. Always refer to your vehicle's service manual for specific installation procedures and torque specifications.