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

A full-groove main bearing has a continuous groove around the entire inside circumference, allowing oil to flow all the way around the crankshaft journal. A half-groove bearing has a groove that only goes partway around, which is often used in engines where the oil feed is only on one side of the bearing saddle. This set is a half-groove type.

What material is used for these ACL main bearings?

ACL utilizes a specialized overlay material designed to withstand the pressures and temperatures typical of V8 engines. This material helps ensure durability and consistent performance for your crankshaft.

Do I need any special tools to install main bearings?

Installing main bearings typically requires engine disassembly, including removing the crankshaft. You'll need specialized bearing installation tools, a torque wrench for proper tightening of the main caps, and a clean work environment to prevent contamination.

ACL Chrysler V8 Crankshaft Main Bearing Set 5M540A-30

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-t14-630818
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 (1956-73). Direct fit for many Mopar V8s.

Key Features

Fits Chrysler V8 engines 273ci, 318ci, and 326ci from 1956-1973.
Half-groove bearing design for proper oil flow.
ACL uses a specialized overlay material for durability.
Meets or exceeds OEM specifications for reliable performance.
Designed for classic Mopar V8 engine rebuilding projects.

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

ACL's 5M540A-30 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 a critical component for the health of your engine's rotating assembly, supporting the crankshaft as it spins. If you're rebuilding an older Mopar V8, getting the right bearings is key to a smooth-running, long-lasting powerplant.

This particular set is a half-groove configuration, which is important for oil distribution in certain engine designs. ACL uses a specialized overlay material that's designed to handle the pressures and temperatures found in these classic V8s. They're made to meet or exceed OEM specifications, ensuring a solid fit and reliable performance for your engine build. When you're putting together a classic Mopar, using well-built internal components like these bearings makes a real difference.

This set fits a wide range of Chrysler, Dodge, and Plymouth V8 applications from the mid-50s through the early 70s. Always double-check your specific engine's requirements to ensure this half-groove set is the correct choice for your rebuild project.