What does '.001 Oversized' mean for these main bearings?

This means the bearings are manufactured to be one thousandth of an inch larger in diameter than standard. They are intended for use when the crankshaft journals have been machined down by exactly that amount during an engine rebuild.

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

The CT-1 coating helps to improve oil distribution and reduce friction between the bearing surface and the crankshaft. This can lead to better wear resistance and help protect the bearings, especially under high-load conditions.

Are these bearings suitable for a stock rebuild or a performance build?

These are ACL Race Series bearings, indicating they are designed with performance and durability in mind. The .001 oversize and narrow width features suggest they are best suited for rebuilt or performance engines where specific tolerances are being met.

Specifications

Brand: ACL
Part #: 5M829HNC-01
UPC: 9315726465103

ACL Chevy 396/402/427/454 Race Series .001 Oversized 0.080in Narrow Main Bearing Set - CT-1 Coated

Name: ACL Chevy 396/402/427/454 Race Series .001 Oversized 0.080in Narrow Main Bearing Set - CT-1 Coated
Brand: ACL
SKU: acl-acl-chevy-396-402-427-454-race-series-001-oversized-0-080in-narrow-main-bear-t14-372731
Price: 213.07 USD
Availability: BackOrder

$213.07

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ACL Chevy 396-454 Race Series main bearing set. .001 oversize, 0.080in narrow, 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 and C15/C1500 Suburban.
ACL Race Series main bearings are built for performance and durability.
This set is .001 inch oversized for use with a machined crankshaft.
Features a 0.080 inch narrow width, suitable for specific engine builds.
Includes CT-1 coating for improved lubrication and reduced friction.

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Will this fit your vehicle?

About this part

Product Details

Rebuilding the bottom end of your big-block Chevy engine? Whether you're working on a 396, 402, 427, or 454, getting the main bearings right is crucial for engine longevity and performance. This ACL Race Series main bearing set is designed for those builds where reliability and durability are key.

These bearings are .001 inch oversized, meaning they're intended for crankshafts that have been machined down by one thousandth of an inch. The 0.080-inch narrow width is a specific design choice for certain performance applications, often used with specific crankshafts or block configurations. The CT-1 coating is a notable feature, offering improved lubrication and reduced friction, which helps protect the bearings under demanding conditions. ACL is known for well-built engine components, and this set is no exception, offering solid construction for your rebuild.

This set includes main bearings for a wide range of Chevrolet and GMC vehicles from the mid-60s to mid-70s, covering popular models like the Impala, Chevelle, Corvette, and C/K series trucks. Make sure to verify your specific engine displacement and crankshaft condition before ordering to ensure this .001 oversize set is the correct choice for your build.