What does the .020 undersize mean for my engine rebuild?

The .020 inch undersize indicates that these bearings are intended for a crankshaft that has been machined down by 0.020 inches from its original size. This is typically done to correct wear or imperfections on the crankshaft journals. You'll need to have your crankshaft measured by a machine shop to confirm if this size is appropriate for your rebuild.

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

The 120-degree oil groove is designed to help distribute oil more evenly around the main bearing journal. This ensures that the bearing receives a consistent supply of lubrication, which is critical for reducing friction and heat, especially under high load conditions.

Are these bearings compatible with all LS engines?

This specific set is designed for GM LS Gen III and Gen IV V8 engines. While these generations cover a broad range of vehicles, it's important to check the detailed fitment list to ensure compatibility with your specific vehicle's engine code and model year.

ACL Main Bearing Set .020 Oversize 5M7299H-020

Name: ACL Chevy V8 LS Gen III/IV .020 Oversized Main Bearing Set
Brand: ACL
Price: 162.27 USD
Availability: InStock

ACL Chevy V8 LS Gen III/IV .020 Oversized Main Bearing Set

$162.27

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ACL Chevy V8 LS Gen III/IV .020 Oversized Main Bearing Set. For GM LS Gen III - IV engines.

Key Features

Fits 61+ vehicle make/model combinations.
Designed for GM LS Gen III and Gen IV V8 engines.
Main bearing set with a 120-degree oil groove for consistent oil flow.
Bearings are .020 inch (0.50mm) undersize for machined crankshafts.
Well-built engine bearings from ACL.

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Will this fit your vehicle?

Product Details

You get a full set of main bearings in this kit, which means one box handles the critical bottom-end component for your engine rebuild. This ACL set is specifically made for GM LS Gen III and Gen IV V8 engines, offering a .020 inch undersize to help you get your crankshaft back in spec if it's seen some wear. These bearings feature a 120-degree oil groove, which helps ensure consistent oil flow to the main journals, crucial for keeping things cool and lubricated under load.

ACL has been making engine bearings for a long time, and this set is a well-built option for anyone rebuilding their LS engine. The .020 inch undersize means these are intended for a crankshaft that has been machined down by that amount. If your crankshaft is still within its original tolerances, you'd want a standard size bearing instead. It's important to have your crankshaft measured by a machine shop to determine the correct bearing size needed for your rebuild.

This set is designed to fit a wide range of GM LS Gen III and IV applications, from Corvettes and Camaros to Silverado trucks and Cadillac SUVs. Make sure to check the fitment list to confirm it matches your specific vehicle. When you're rebuilding an engine, getting the right bearing size is key to a long-lasting, healthy powerplant.