What does '.01mm undersize' mean for these bearings?

This means the bearings are manufactured to be slightly smaller than the original factory size by 0.01 millimeters. This is common when a crankshaft has been reconditioned or 'ground' to a smaller diameter to ensure a proper, tight fit.

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

The 270-degree oil groove is designed to maintain a continuous oil supply to the crankshaft journal throughout its rotation. This helps prevent oil starvation and ensures better lubrication, especially under demanding driving conditions.

Are these bearings suitable for a stock engine rebuild?

Yes, these ACL Race Series bearings are a well-built option for both performance builds and stock engine rebuilds. The .01mm undersize is a standard size for crankshaft machining, and the improved oiling features are beneficial for any LS engine.

ACL Main Bearing Set 5M7298H-01 for Chevy V8 LS Engines

Name: ACL Chevy V8 4.8/5.3/5.7/6.0L Race Series .01mm Oversized Main Bearing Set
Brand: ACL
SKU: acl-acl-chevy-v8-4-8-5-3-5-7-6-0l-race-series-01mm-oversized-main-bearing-set-t14-427558
Price: 175.51 USD
Availability: InStock

ACL Chevy V8 4.8/5.3/5.7/6.0L Race Series .01mm Oversized Main Bearing Set

$175.51

Only 1 left in stock

ACL Chevy V8 4.8/5.3/5.7/6.0L Race Series .01mm Oversized Main Bearing Set for GM LS Gen III - IV engines.

Key Features

Fits 61+ vehicle make/model combinations including Buick, Cadillac, Chevrolet, GMC, and Pontiac.
ACL Race Series main bearing set for GM LS Gen III - IV engines.
Features a 270-degree oil groove for improved oil flow.
Bearings are .01mm undersize for use with machined crankshafts.
Designed for Chevy V8 engines with 4.8L, 5.3L, 5.7L, and 6.0L displacements.

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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 rebuild for your Chevy V8 LS Gen III or IV engine. These ACL Race Series bearings are built with a 270-degree oil groove, which helps ensure consistent oil flow to the crankshaft journals, even under high-performance conditions. They are also .01mm undersize, meaning they're designed for crankshafts that have been machined to a slightly smaller diameter during a rebuild.

ACL has been making engine bearings for a long time, and this Race Series set is a well-built option for anyone rebuilding an LS engine. The .01mm undersize is a common machining size, making these a good choice if your crankshaft needs a light grind. The 270-degree oil groove is a notable feature that helps maintain oil pressure and lubrication, which is crucial for keeping your engine running smoothly, especially if you're pushing the limits.

This set is specifically for the GM LS Gen III and IV engines, covering displacements from 4.8L up to 6.0L. Make sure to verify fitment for your specific vehicle, as these bearings are intended for the crankshaft journals and require proper installation by a qualified mechanic.