What is the purpose of extended oil clearance?

Extended oil clearance allows for a slightly larger gap between the bearing and the crankshaft. This can improve oil flow and cooling, which is beneficial for engines that operate at higher RPMs or under heavy loads, helping to prevent oil starvation and reduce bearing wear.

What does the CT-1 coating do?

The CT-1 coating on these ACL bearings aids in the initial break-in process by providing a smooth, durable surface. It helps to reduce friction during the critical first few hours of engine operation and contributes to the overall longevity of the bearing.

Do these bearings come with installation hardware?

This listing is for the main bearing set only. Installation hardware, such as main bearing cap bolts or studs, is typically sold separately and should be sourced according to your engine's specific requirements and rebuild procedures.

Specifications

Brand: ACL
Part #: 5M829HXC-STD
UPC: 9315726458082

ACL Chevy V8 396/402/427/454 Race Series STD Size Main Bearing Set with Ext Oil Clearance - CT-1 Ctd

Name: ACL Chevy V8 396/402/427/454 Race Series STD Size Main Bearing Set with Ext Oil Clearance - CT-1 Ctd
Brand: ACL
SKU: acl-acl-chevy-v8-396-402-427-454-race-series-std-size-main-bearing-set-with-ext--t14-372733
Price: 213.07 USD
Availability: BackOrder

$213.07

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ACL Chevy V8 396/402/427/454 Race Series STD Size Main Bearing Set with Extended Oil Clearance.

Key Features

Fits 1965-1974 Chevrolet and GMC V8 engines including 396, 402, 427, and 454 cubic inch displacements.
ACL Race Series main bearings are built for performance applications.
Features extended oil clearance for improved lubrication in high-RPM or demanding conditions.
Includes ACL's CT-1 coating for enhanced break-in and durability.
Standard size bearings are intended for use with a crankshaft that is within factory specifications.
Well-built components from a reputable engine parts manufacturer.

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Will this fit your vehicle?

About this part

Product Details

Doing an engine rebuild on your classic Chevy V8, like a 396, 402, 427, or 454? When you're getting into the bottom end, the main bearings are critical. These Race Series main bearings from ACL are built for performance applications where precise oil control is key. They feature extended oil clearance, which is a smart move when you're building an engine that will see higher RPMs or operate under demanding conditions. This helps ensure proper lubrication and can reduce bearing wear over time.

ACL has a solid reputation for making well-built engine components, and these bearings are no exception. They use a special CT-1 coating that helps with initial break-in and provides a durable surface for the crankshaft to ride on. Because they're standard size, they're meant to be used with a crankshaft that's still within factory specifications. If your crank has been ground undersize, you'll need a different bearing set.

This set is designed to fit a wide range of Chevrolet V8 engines from the mid-60s through the mid-70s, including popular models like the Impala, Chevelle, Camaro, and Corvette, as well as many truck applications. Make sure to check the full fitment list to confirm compatibility with your specific vehicle. When you're putting an engine back together, using good bearings is one of the most important steps for long-term reliability.