What does the 270-degree oil groove do?

The 270-degree oil groove is a design feature that helps maintain a continuous oil supply to the crankshaft main bearing. This improved lubrication is crucial for reducing friction and wear, especially in high-performance or heavily loaded engines.

Why are these bearings undersize?

These bearings are 0.020 inches undersize, meaning they are intended for use when the crankshaft journals have been machined down by 0.020 inches. This ensures the correct bearing clearance and proper fit on a reconditioned crankshaft.

What other parts are typically needed when replacing main bearings?

When replacing main bearings, it's common practice to also replace the connecting rod bearings. You will also need new engine oil and an oil filter. It's also recommended to have the crankshaft inspected and measured for straightness and journal condition.

Specifications

Brand: ACL
Part #: 5M7298H-20

ACL Chevrolet V8 4.8/5.3/5.7/6.0L Race Series Engine Crankshaft Main Bearing Set

Name: ACL Chevrolet V8 4.8/5.3/5.7/6.0L Race Series Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-chevrolet-v8-4-8-5-3-5-7-6-0l-race-series-engine-crankshaft-main-bearing-t14-630736
Price: 184.76 USD
Availability: BackOrder

$184.76

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ACL Race Series crankshaft main bearing set for Chevrolet V8 4.8/5.3/5.7/6.0L engines. Features a 270-degree oil groove for improved lubrication.

Key Features

Fits 1999-2019 Chevrolet Silverado, Suburban, Tahoe, and Express models with 4.8L, 5.3L, 5.7L, and 6.0L V8 engines, among other GM LS Gen III-IV applications.
Race Series main bearing set features a 270-degree oil groove for enhanced lubrication.
Bearings are 0.50mm / 0.020" undersize, suitable for crankshafts that have been machined.
ACL is a well-known manufacturer of engine bearings.

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About this part

Product Details

When you're rebuilding a GM LS Gen III-IV V8 engine, especially for performance applications, the crankshaft main bearings are critical. This Race Series set from ACL is built with a 270-degree oil groove, which is a notable design choice that helps ensure consistent oil flow to the main journals, even under high-stress conditions. This improved lubrication is key to preventing premature wear and maintaining engine health when you're pushing the limits.

These bearings are also .50mm or 0.020 inches undersize, which is important if your crankshaft journals have been machined down during a rebuild. Using the correct undersize bearing ensures a proper fit and correct oil clearance, which is essential for engine longevity and performance. ACL has a solid reputation for making well-built engine components, and this Race Series set is designed for those who demand more from their engine.

This set fits a wide range of Chevrolet V8 engines, including those found in many Silverado, Suburban, Tahoe, Corvette, and Express van models, as well as some Buick and Cadillac vehicles. Always double-check the fitment guide to ensure these bearings are the right match for your specific engine build.