What does '0.040 inch undersize' mean for these bearings?

This means the bearings are manufactured to be 0.040 inches smaller in diameter than standard size. This is necessary if your engine's crankshaft has been previously machined down (ground) by 0.040 inches to correct wear or damage.

What is the significance of the 'half-groove' design?

The half-groove design refers to the oiling groove being present on only half of the bearing's circumference. This is a specific design choice for certain engine applications to ensure proper oil distribution to the crankshaft journals.

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 (also known as rod bearings). You will also need new engine oil and potentially a new oil pump and oil filter for a complete service.

Specifications

Brand: ACL
Part #: 5M540P-40

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-t14-632426
Price: 25.63 USD
Availability: BackOrder

$25.63

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

Key Features

Fits Dodge 330, 440, CB300, Challenger, Charger, Coronet, and Dart models from various years between 1960 and 1973.
Designed for Chrysler V8 engines with 273, 318, and 326 cubic inch displacements.
Main bearing set is 0.040 inch undersize, suitable for crankshafts machined to this specification.
Features a half-groove design for specific oiling requirements in compatible Chrysler engines.
Helps support the crankshaft and reduce friction within the engine block.

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About this part

Product Details

This ACL main bearing set is built for Chrysler V8 engines, specifically the 273, 318, and 326 cubic inch displacements produced between 1956 and 1973. These bearings are crucial for supporting the crankshaft and ensuring it spins smoothly within the engine block. This particular set is 0.040 inches undersize, which is important if your crankshaft has been previously machined to account for wear. The half-groove design is specific to certain Chrysler engine applications, ensuring proper oil flow to the crankshaft journals.

Properly installed main bearings reduce friction and wear on your engine's rotating assembly. This set is a solid option for rebuilding or repairing your classic Mopar V8. Always refer to your vehicle's service manual for the correct installation procedures and torque specifications.