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

Half-groove main bearings have oiling grooves on only one side of the bearing shell. Full-groove bearings have a continuous groove around the entire inside diameter. Half-groove designs are common in many V8 engines and help ensure consistent oil delivery to the crankshaft journal.

Do I need to measure my crankshaft before ordering these bearings?

Yes, it's highly recommended. These are standard size bearings, meaning they are designed for crankshaft journals that are within factory specifications. If your crankshaft has been previously machined undersize due to wear or damage, you will need to order an undersize bearing set.

What else might I need for this engine rebuild?

When rebuilding an engine, you'll typically need a full gasket set, oil pump, oil filter, and potentially piston rings and rod bearings depending on the scope of your rebuild. Always refer to your vehicle's service manual for a complete parts list and procedures.

Specifications

Brand: ACL
Part #: 5M540A-STD

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-t14-630900
Price: 32.77 USD
Availability: BackOrder

$32.77

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ACL Chrysler V8 273-318-326 Engine Crankshaft Main Bearing Set. Direct fit for many Mopar V8s.

Key Features

Fits Chrysler V8 273ci and 318ci engines from 1956-1973.
Standard size bearings for use with factory-spec crankshaft journals.
Half-groove main bearing design for optimal oil distribution.
Well-built for reliable engine performance.
Direct fit for numerous Dodge and Chrysler models including Challenger, Charger, and Dart.

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About this part

Product Details

You get a full set of main bearings in this kit, which means one box handles the critical bottom-end rebuild for your Mopar V8. These bearings are what the crankshaft rides on inside the engine block. Getting the right fit and material here is key to a healthy engine rebuild, especially for those classic 273ci and 318ci engines from 1956 through 1973.

ACL has been making engine bearings for a long time, and this set is built to meet the demands of these older V8s. They're a standard size, meaning they're meant to be used when the crankshaft journals are still within factory specifications. If your crankshaft has been machined undersize, you'll need a different bearing set. This particular set features half-groove main bearings, which is common for many V8 applications and helps ensure proper oil flow to the bearing surface.

When you're rebuilding an engine, the crankshaft main bearings are one of those parts you don't want to skimp on. This ACL set is a solid option for getting your classic Mopar back on the road. Make sure to check your crankshaft journals for wear or damage before installation, and always follow the manufacturer's recommended torque and oiling procedures during assembly.