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

A full-groove main bearing has a continuous groove around its circumference, which helps distribute oil to the entire crankshaft journal. A half-groove bearing has a groove on only one side, typically used in applications where the crankshaft is partially supported by the main cap and partially by the block, ensuring oil reaches the necessary areas.

Are these bearings undersized or oversized?

This ACL 5M540A-10 bearing set is standard size. If your crankshaft has been machined (ground), you will need to order an undersized bearing set to match the new journal dimensions.

What else might I need when installing these main bearings?

When installing main bearings, it's critical to have clean engine components and the correct assembly lube. You'll also need a reliable torque wrench to tighten the main caps to the manufacturer's specifications. It's also a good idea to have a dial indicator to check crankshaft end play.

ACL Engine Crankshaft Main Bearing Set 5M540A-10

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-t14-630556
Price: 32.77 USD
Availability: BackOrder

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

$32.77

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. Essential for engine rebuilds, ensuring proper crankshaft support.

Key Features

Fits 1956-1973 Chrysler V8 273, 318, and 326ci engines.
Half-groove design for optimal oil distribution.
Well-built by ACL for reliable engine performance.
Essential component for engine rebuilding and repair.

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Will this fit your vehicle?

Product Details

When you're rebuilding a Chrysler V8 engine from the 273, 318, or 326 cubic inch families, getting the crankshaft main bearings right is crucial. This set from ACL is built to support your crankshaft, allowing it to spin smoothly and efficiently within the engine block. These bearings are specifically designed for engines produced between 1956 and 1973, ensuring a proper fit for your project.

This particular set is a half-groove configuration, which is important for oil distribution to the crankshaft journals. ACL uses well-built materials to create bearings that can withstand the pressures and temperatures inside your engine. Proper bearing installation is key to a long-lasting engine rebuild, so make sure to follow the manufacturer's installation guidelines closely.

This set is designed for a range of Dodge and Plymouth vehicles from the mid-50s through the early 70s. If you're in the middle of a restoration or a performance build on one of these classic Mopar V8s, this ACL main bearing set is a solid option to get your engine back in running order.