What does '.20mm undersize' mean for these bearings?

This means the bearings are slightly smaller than standard size. They are intended for use with a crankshaft that has been machined down by 0.20mm to ensure proper clearance and fit.

What is the purpose of the different oil grooves on these bearings?

The oil grooves help distribute oil evenly around the crankshaft journal. The specific 120-degree and 180-degree grooves are designed to maintain a consistent oil film, reducing friction and wear.

Are these bearings suitable for a stock, unmachined crankshaft?

No, these bearings are specifically .20mm undersize and require a crankshaft that has been machined down by that amount. Using them on a standard-sized crankshaft will result in incorrect clearances and potential engine damage.

ACL 1997+ Chevy V8 4.8/5.3/5.7/6.0 Gen 3 .20mm Oversized Main Bearing Set

Specifications

Brand: ACL
Part #: 5M7298A-20
UPC: 084777700941

ACL 1997+ Chevy V8 4.8/5.3/5.7/6.0 Gen 3 .20mm Oversized Main Bearing Set

Name: ACL 1997+ Chevy V8 4.8/5.3/5.7/6.0 Gen 3 .20mm Oversized Main Bearing Set
Brand: ACL
Price: 25.59 USD
Availability: InStock

$25.59

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Key Features

Fits 1997-2004 and 2006-2013 Chevrolet Corvette.
Designed for Gen 3 V8 engines (4.8L, 5.3L, 5.7L, 6.0L).
Set is .20mm undersize for use with a machined crankshaft.
Intermediate bearings feature a 120-degree oil groove on the upper half.
Thrust bearings feature a 180-degree oil groove on the upper half.
Helps maintain proper oil pressure and crankshaft support.

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Fits these vehicles

Chevrolet Camaro 1998-2002, 2010-2015
Chevrolet Corvette 1997-2004, 2006-2013

Product Details

ACL has been making engine bearings for decades, and this main bearing set for your Chevrolet Corvette is one of their staples. When you're rebuilding or refreshing the engine in your 1997-2004 or 2006-2013 Corvette with a Gen 3 V8 (4.8L, 5.3L, 5.7L, or 6.0L), a fresh set of main bearings is crucial for proper crankshaft support and oil pressure.

This set is .20mm undersize, meaning it's designed to be used with a crankshaft that has been machined down by that amount. The bearings feature specific oil groove designs: the intermediate bearings have a 120-degree groove on the upper half, while the thrust bearings have a 180-degree groove on the upper half. These grooves help ensure consistent oil flow to the critical bearing surfaces, which is essential for reducing friction and wear, especially under load.

Installing new main bearings is a key part of any engine rebuild. Make sure you have the necessary tools and follow the manufacturer's instructions for proper installation and clearance checks.