What does the 270-degree oil groove do?

The 270-degree oil groove is a design feature that helps maintain a consistent oil film between the bearing and the crankshaft journal. This is especially important in high-performance or high-load situations to prevent metal-to-metal contact and reduce wear.

Are these bearings a direct fit for my engine?

This is a standard size bearing set, meaning it's intended to fit factory-spec crankshaft journals without requiring any machining. However, it's crucial that your crankshaft journals are within the manufacturer's specified tolerances for wear and roundness for a proper fit.

What is the difference between standard and undersize bearings?

Standard size bearings are meant to be used when the crankshaft journals are still within their original factory specifications. Undersize bearings (e.g., -0.010" or -0.020") are used when the crankshaft journals have been machined down to correct for wear or damage.

Specifications

Brand: ACL
Part #: 5M7298H-STD
UPC: 9315726152621

ACL Chevy V8 4.8/5.3/5.7/6.0L Race Series Standard Size Main Bearing Set

Name: ACL Chevy V8 4.8/5.3/5.7/6.0L Race Series Standard Size Main Bearing Set
Brand: ACL
SKU: acl-acl-chevy-v8-4-8-5-3-5-7-6-0l-race-series-standard-size-main-bearing-set-t14-262700
Price: 184.76 USD
Availability: BackOrder

$184.76

On Backorder — Expected to ship by Jun 7, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

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

Key Features

Fits Buick LaCrosse, Rainier; Cadillac CTS, Escalade ESV, EXT, Escalade; Chevrolet Avalanche 1500, Avalanche, Colorado, Corvette, Express 1500, 2500, 3500, Impala, LCF 3500, Monte Carlo, SSR, Silverado 1500 HD Classic, Silverado 1500 HD, Silverado 1500, Silverado 2500 HD Classic, Silverado 2500 HD, Silverado 2500, Silverado 3500 Classic, Silverado 3500 HD, Silverado 3500, Suburban 1500, Suburban 2500, Suburban 3500 HD, Tahoe; GMC Sierra 1500 HD, Sierra 1500, Sierra 2500 HD Classic, Sierra 2500 HD, Sierra 2500, Sierra 3500 HD, Sierra 3500, Yukon XL 2500, Yukon XL, Yukon; Pontiac Grand Prix, Grand Prix; Saab 9-7x. See fitment details for specific years.
ACL Race Series main bearings are built for performance applications.
Features a 270-degree oil groove for improved oil flow.
Standard size bearings are designed for direct replacement without crankshaft machining.
Designed for GM LS Gen III - IV V8 engines with 4.8L, 5.3L, 5.7L, and 6.0L displacements.

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Will this fit your vehicle?

About this part

Product Details

When you're rebuilding a GM LS Gen III or IV V8 engine, especially for performance applications, the main bearings are critical. This Race Series set from ACL is built with a 270-degree oil groove, which helps ensure consistent oil flow to the crankshaft even under high loads. This is a standard size set, meaning it's designed to replace your original bearings without needing any machine work on the crankshaft journals, assuming they are still within factory specifications.

ACL has a solid reputation for making well-built engine bearings. This Race Series set uses advanced materials and construction techniques to handle the increased stresses of performance engines. The standard size and the 270-degree oil groove are key features that make these a popular choice for LS engine builds where reliability and performance are both important. They are designed to fit right into the factory main bearing bores.

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