What does '.10mm Oversized' mean for these main bearings?

This means the bearings are manufactured to be 0.010 inches (or 0.25mm) smaller in diameter than standard. This allows them to be used with a crankshaft that has been professionally machined down by 0.010 inches to ensure a precise fit and proper oil clearance.

What is the benefit of the 270-degree oil groove?

The 270-degree oil groove is an advanced design that helps maintain a continuous oil supply to the crankshaft journal. This is particularly beneficial in high-performance or high-RPM applications where oil pressure can fluctuate, helping to prevent bearing wear.

Do these bearings come with the necessary hardware for installation?

This listing is for the main bearing set only. You will need to refer to your engine's service manual for any additional hardware or installation procedures required.

ACL Engine Bearings Race Series .10mm Oversized Main Bearing

Name: ACL Chevy V8 4.8/5.3/5.7/6.0L Race Series .10mm Oversized Main Bearing Set
Brand: ACL
SKU: acl-acl-chevy-v8-4-8-5-3-5-7-6-0l-race-series-10mm-oversized-main-bearing-set-t14-371829
Price: 175.51 USD
Availability: InStock

ACL Chevy V8 4.8/5.3/5.7/6.0L Race Series .10mm Oversized Main Bearing Set

$175.51

Only 2 left in stock

ACL Chevy V8 4.8/5.3/5.7/6.0L Race Series .10mm Oversized Main Bearing Set for GM LS Gen III - IV engines.

Key Features

Fits 61+ vehicle make/model combinations, including many GM LS Gen III - IV V8 engines.
Race Series main bearing set with a 270-degree oil groove for improved oil flow.
Bearings are .010 inch (0.25mm) undersize, requiring a machined crankshaft.
Designed for 4.8L, 5.3L, 5.7L, and 6.0L GM LS V8 engines.
Well-built construction from ACL, a reputable engine bearing manufacturer.

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Will this fit your vehicle?

Product Details

If you're rebuilding the bottom end of your GM LS Gen III or IV V8 engine, you're likely looking for a solid set of main bearings. This Race Series set from ACL is built for performance applications and comes with a 270-degree oil groove, which helps ensure consistent oil flow to the crankshaft, especially under demanding conditions. These bearings are .010 inches (0.25mm) undersize, meaning they're designed to be used with a crankshaft that has been machined to match this specific size.

ACL has been making engine bearings for a long time, and this Race Series set is a well-built option for anyone pushing their LS engine a bit harder. The .010 undersize means you'll need to have your crankshaft ground to this specification before installation, so make sure that's part of your machine shop's plan. This set is designed for engines with displacements of 4.8L, 5.3L, 5.7L, and 6.0L, covering a wide range of popular GM trucks and performance cars.

This set fits a lot of different GM vehicles, including many Chevrolet Silverado, Suburban, Tahoe, and Express van models, as well as Cadillac Escalades and various Buick and Chevrolet cars. Always double-check your specific engine code and ensure your crankshaft has been machined to the .010 undersize specification before ordering.