What is the difference between a full-groove and half-groove main bearing?

Full-groove bearings have a continuous groove around the entire circumference, allowing oil to flow freely to the entire bearing surface. Half-groove bearings have a groove that only goes partway around, which is often used in applications where the crankshaft is drilled for oil passage on one side. This set is a half-groove type.

What vehicles does this ACL main bearing set fit?

This set fits a variety of Dodge and Plymouth vehicles equipped with 273ci, 318ci, and 326ci V8 engines produced between 1956 and 1973. Examples include the Dodge Charger, Challenger, Coronet, Dart, and Plymouth Barracuda.

Are these bearings undersized or oversized?

This ACL main bearing set is manufactured to standard (stock) dimensions for the specified engine applications. It is not an undersize or oversize bearing set.

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Trusted Since 1957

Est. 1957

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

Specifications

Brand: ACL
Part #: 5M540A-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-t14-630775
Price: 27.75 USD
Availability: BackOrder

$27.75

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

ACL Chrysler V8 273-318-326 Engine Crankshaft Main Bearing Set (1956-73). Direct fit for classic Mopar V8s.

Key Features

Fits 1956-1973 Chrysler Prod. V8 engines (273ci, 318ci, 326ci).
Half-groove bearing set for proper oil flow.
Designed to meet original equipment specifications.
Well-known ACL brand for engine components.
Direct fit for a wide range of Dodge and Plymouth vehicles from the era.

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Will this fit your vehicle?

Product Details

If you're rebuilding a classic Chrysler V8 like a 273, 318, or 326, getting the crankshaft bearings right is crucial for engine health. This main bearing set from ACL is built to spec for those engines from 1956 through 1973. These bearings are what the crankshaft rides on inside the engine block, and they need to be precise to ensure proper oil clearance and smooth operation.

This particular set is a half-groove configuration, which is common for many V8 applications of this era. ACL is a well-known name in engine bearings, and this set is made to meet the original equipment specifications. Getting the right fit and finish on your bearings means a quieter, more reliable engine that will last.

This set is designed for the 273ci and 318ci engines, covering a wide range of Mopar vehicles from the mid-50s to the early 70s. Make sure to check the fitment details to confirm it matches your specific application.