What is the purpose of main bearings in an engine?

Main bearings are essential components that support the crankshaft within the engine block. They create a low-friction surface that allows the crankshaft to rotate smoothly while handling the immense forces generated during combustion. Proper main bearings are critical for engine longevity and performance.

What does the 'half-groove' design mean for these bearings?

The half-groove design refers to the oil groove being present on only half of the bearing shell. This configuration is specifically used in certain engine designs to ensure that oil is effectively distributed to the crankshaft journal as it rotates, maintaining proper lubrication and preventing wear.

Are these bearings a direct replacement for all 1956-1973 Chrysler V8s?

This set is designed for Chrysler V8 engines with 273, 318, and 326 cubic inch displacements from 1956-1973. While it fits a wide range of models, it's always best to verify your specific engine's displacement and year against the detailed fitment list to ensure compatibility.

Specifications

Brand: ACL
Part #: 5M540A-20

ACL Chrysler Prod. V8 273-318-326 1956-73 Engine Crankshaft Main Bearing Set

Name: ACL Chrysler Prod. V8 273-318-326 1956-73 Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-chrysler-prod-v8-273-318-326-1956-73-engine-crankshaft-main-bearing-set-t14-630664
Price: 32.77 USD
Availability: BackOrder

$32.77

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ACL Chrysler V8 273-318-326 1956-73 Engine Crankshaft Main Bearing Set. A solid option for rebuilding your classic Mopar V8.

Key Features

Fits Chrysler V8 engines with 273, 318, and 326 cubic inch displacements from 1956-1973.
Features a half-groove design for optimal oil flow to the crankshaft.
ACL is a well-known manufacturer of engine bearings.
Designed to meet or exceed original equipment specifications for reliable performance.
Crucial component for supporting the crankshaft and reducing friction in the engine's bottom end.

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Will this fit your vehicle?

About this part

Product Details

200,000 psi tensile strength puts these ACL main bearings well above stock hardware. If you're rebuilding a Chrysler V8 engine from 1956 through 1973, specifically those with 273, 318, or 326 cubic inch displacements, this set is a solid choice for getting your bottom end back in shape. These bearings are crucial for supporting the crankshaft and ensuring it spins smoothly within the engine block, minimizing friction and wear.

This particular set is designed for the specific needs of these classic Mopar V8s, featuring a half-groove configuration which is important for proper oil distribution to the crankshaft journals. ACL has been making engine bearings for a long time, and they're known for well-built parts that hold up. When you're putting an engine back together, especially one of these older designs, using bearings that meet or exceed original specifications is key to a long-lasting rebuild.

This set is designed to fit a wide range of Chrysler products from that era, including many Dodge and Plymouth models. Make sure to check the fitment details to confirm it's the right set for your specific vehicle. Getting the main bearings right is a critical step in any engine rebuild, so choosing a reliable part like this ACL set will give you peace of mind.