What is the purpose of the CT-1 coating on these bearings?

The CT-1 coating is a dry film lubricant applied to the bearing surface. Its main purpose is to reduce friction and wear, particularly during critical engine startup and break-in periods when oil flow might not be fully established.

What does 'narrowed' mean in the context of these main bearings?

A narrowed main bearing has a slightly reduced width compared to a standard bearing. This allows for a larger fillet radius on the crankshaft, which can increase the strength of the crankshaft in high-performance or high-stress applications.

Do these bearings come with installation hardware?

This product is a set of main bearings only. Installation hardware, such as main cap bolts or oil, is not included and should be sourced separately according to your engine's service manual.

Specifications

Brand: ACL
Part #: 5M829HNC-STD
UPC: 9315726458020

ACL Chevy V8 396/402/427/454 Race Series Std Size 0.080in Narrowed Main Bearing Set - CT-1 Coated

Name: ACL Chevy V8 396/402/427/454 Race Series Std Size 0.080in Narrowed Main Bearing Set - CT-1 Coated
Brand: ACL
SKU: acl-acl-chevy-v8-396-402-427-454-race-series-std-size-0-080in-narrowed-main-bear-t14-372732
Price: 213.07 USD
Availability: BackOrder

$213.07

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ACL Race Series main bearing set for Chevy V8 396-454 engines. Standard size, narrowed, CT-1 coated.

Key Features

Fits 1965-1974 Chevrolet Bel Air, Biscayne, Blazer, Brookwood, C10 Pickup, C10 Suburban, C20 Pickup, C20 Suburban, C30 Pickup, Camaro, Caprice, Chevelle, Chevy II, Corvette, El Camino, Estate, G10 Van, G20 Van, G30 Van, Impala, K10 Pickup, K10 Suburban, K20 Pickup, K20 Suburban, K30 Pickup, Kingswood, Laguna, Malibu, Monte Carlo, Nova, P10 Van, P20 Van, P30 Van, Townsman, and 1972-1974 Excalibur Phaeton.
Fits 1968-1974 GMC C15/C1500 Pickup, C15/C1500 Suburban.
Standard size bearings for use with a factory-spec crankshaft.
Narrowed main bearing design allows for increased crankshaft fillet radius for added strength.
CT-1 coated surface provides dry film lubrication to reduce friction and wear.
Designed for Chevy V8 engines with displacements of 396, 402, 427, and 454 cubic inches.

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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 Chevy V8. These ACL Race Series bearings are built for performance applications, featuring a standard size and a narrowed design. The narrowed profile allows for a slightly larger crankshaft fillet radius, which can increase strength in high-performance builds. They also come with a CT-1 coating, a dry film lubricant that helps reduce friction and wear, especially during initial engine startup and break-in periods.

These bearings are designed for Chevy big-block V8 engines displacing 396, 402, 427, and 454 cubic inches. The standard size means they are intended to be used with a factory-spec crankshaft. If your crankshaft has been machined, you'll need to check the specific undersize or oversize requirements to ensure proper fitment. The CT-1 coating is a notable feature that adds an extra layer of protection, making them a solid option for engines that see regular use or are built for more demanding applications.

This set is a direct fit for a wide range of Chevrolet and GMC vehicles from the mid-60s to mid-70s, including popular models like the Impala, Chevelle, Camaro, and C/K series trucks. Always refer to your vehicle's specific service manual for detailed installation procedures and torque specifications when rebuilding your engine.