What is the benefit of the 120-degree oil groove?

The 120-degree oil groove helps to distribute oil more evenly around the crankshaft journal. This ensures consistent lubrication across the bearing surface, reducing wear and heat buildup.

What does 'standard size' mean for these bearings?

Standard size bearings are designed to fit a crankshaft journal that is within the manufacturer's original specifications. If your crankshaft has been machined undersize due to wear or repair, you would need an undersize bearing set.

What is the advantage of the extra oil clearance?

The extra 0.001 inch of oil clearance provides a slightly larger oil film between the bearing and the crankshaft. This can offer improved lubrication and protection, especially in engines that experience higher loads or temperatures.

ACL Main Bearing Set 5M7299HX-STD - Chevy V8 LS Gen III/IV

Name: ACL Chevy V8 LS Gen III/IV Standard Size Main Bearing Set
Brand: ACL
Price: 162.27 USD
Availability: InStock

ACL Chevy V8 LS Gen III/IV Standard Size Main Bearing Set

$162.27

Only 4 left in stock

ACL Chevy V8 LS Gen III/IV Standard Size Main Bearing Set. Adds extra oil clearance for improved lubrication.

Key Features

Fits many Buick, Cadillac, Chevrolet, and GMC vehicles with LS Gen III/IV V8 engines.
Standard size bearings fit crankshaft journals that have not been machined undersize.
Features a 120-degree oil groove for improved oil distribution.
Includes an extra 0.001 inch (0.025mm) of oil clearance for enhanced lubrication.
Designed for GM LS Gen III and IV V8 engine applications.

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Will this fit your vehicle?

Product Details

When you're rebuilding or refreshing a GM LS Gen III or IV V8 engine, getting the main bearings right is crucial for long-term health. This set from ACL is built with a 120-degree oil groove, which helps distribute oil more evenly around the crankshaft journal. This design, combined with an extra 0.001 inches of oil clearance over standard specifications, means better lubrication and reduced friction, especially important in high-performance or heavily used engines.

These are standard size bearings, meaning they're designed to fit a crankshaft journal that hasn't been machined undersize. The extra oil clearance is a smart choice if you're looking for a little added protection against oil starvation or if your engine build demands a bit more cushion. ACL has been making engine bearings for a long time, and this set reflects their focus on materials and design that support reliable engine operation.

This set is a solid option for many GM vehicles equipped with LS Gen III and IV V8 engines. Always double-check your specific vehicle's fitment to ensure these bearings are the correct match for your build.