What does '.020 Oversized' mean for these main bearings?

This means the bearings are manufactured to be 0.020 inches larger in diameter than standard. They are intended for use when the engine's crankshaft journals have been machined down by 0.020 inches during an engine rebuild or performance build.

What is the advantage of the extra lower thrust shell?

The extra lower thrust shell provides installation flexibility. You can choose to install it with the upper thrust shell for a full 360-degree thrust bearing setup, or use the upper thrust shell with a plain lower shell for a 180-degree setup, depending on your engine's needs.

Are these bearings suitable for a stock LT1 engine rebuild?

These are ACL Race Series bearings, designed with performance and flexibility in mind. While they can be used in an LT1 rebuild, they are specifically .020 oversized, so they require a crankshaft that has been machined to that specific size. They are not a direct drop-in for a stock, unmachined crankshaft.

Specifications

Brand: ACL
Part #: 5M7292H-020
UPC: 9315726460948

ACL Chevy V8 LT1/LT4/L86 Race Series .020 Oversized High Performance Main Bearing Set

Name: ACL Chevy V8 LT1/LT4/L86 Race Series .020 Oversized High Performance Main Bearing Set
Brand: ACL
SKU: acl-acl-chevy-v8-lt1-lt4-l86-race-series-020-oversized-high-performance-main-bea-t14-424320
Price: 206.13 USD
Availability: BackOrder

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Fits 2016-2024 Chevrolet Camaro and Corvette. ACL .020 oversized main bearing set for GM LT V8 engines.

Key Features

Fits 2016-2024 Chevrolet Camaro and 2014-2019 Chevrolet Corvette.
ACL Race Series main bearing set for GM LT1, LT4, and L86 V8 engines.
Bearings are .020 inches oversized for use with a machined crankshaft.
Includes an additional lower thrust shell for installation flexibility.
Allows for a 360-degree thrust setup with both upper and lower thrust shells.
Offers a 180-degree thrust setup option using the upper thrust shell and a plain lower shell.

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About this part

Product Details

When you're building or rebuilding a GM LT V8 engine, especially for performance use, the main bearings are critical. This ACL Race Series set is designed for engines like the LT1, LT4, and L86, and it's .020 inches oversized, meaning it's meant for crankshafts that have been machined down by 0.020 inches. Getting the right bearing clearance is key for oil pressure and engine longevity, particularly when you're pushing the engine harder than stock.

What sets this ACL set apart is the inclusion of an extra lower thrust shell. This gives you flexibility during installation. You can choose to run a full 360-degree thrust setup by using both upper and lower thrust shells, which offers maximum support. Alternatively, you can opt for a 180-degree setup by using the upper thrust shell and a plain lower shell, which might be preferred in certain racing applications. This attention to detail in the design helps ensure proper oil flow and bearing support under demanding conditions.

This set is specifically for the GM LT V8 engines found in models like the Chevrolet Camaro from 2016-2024 and the Corvette from 2014-2019. Make sure your crankshaft has been machined to the correct .020 inch undersize before installing these bearings. Proper installation is crucial for engine performance and durability.