What does the '0.010 inch undersize' mean for these bearings?

This means the bearings are manufactured to be 0.010 inches smaller in diameter than standard size. This is used when your crankshaft journals have been ground down (undersized) to remove damage or to achieve specific clearances in a performance build.

Are these bearings suitable for a stock engine rebuild?

These are considered a race series bearing and are designed for performance applications where precise oil clearance is critical. While they can be used in some rebuilds, they are optimized for higher stress and may not be the best choice for a completely stock, mild rebuild unless specific clearance goals are being met.

What is the benefit of the 'narrowed' design?

The narrowed design helps to ensure that the bearing does not extend beyond the chamfered edge of the crankshaft fillet. This prevents the bearing from being starved of oil at the chamfer and helps maintain proper oil film thickness under load.

Specifications

Brand: ACL
Part #: 8B743HND-010

ACL Chevrolet V8 396-402-427-454 Narrowed Race Series with Dowel Engine Connecting Rod Bearing Set

Name: ACL Chevrolet V8 396-402-427-454 Narrowed Race Series with Dowel Engine Connecting Rod Bearing Set
Brand: ACL
SKU: acl-acl-chevrolet-v8-396-402-427-454-narrowed-race-series-with-dowel-engine-conn-t14-630886
Price: 144.78 USD
Availability: BackOrder

$144.78

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ACL Chevrolet V8 396-454 narrowed connecting rod bearings. Part# 8B743HND-010. 0.010 inch undersize.

Key Features

Fits 63+ Chevrolet and GMC V8 vehicles from 1965-1974.
Narrowed race series design for optimal oil clearance in performance engines.
Includes dowels for precise positioning in the connecting rod.
0.010 inch undersize for use with machined crankshafts.
ACL brand engine bearings.

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About this part

Product Details

If you're building a high-performance Chevrolet V8, especially one with a 396, 402, 427, or 454 cubic inch engine, these narrowed race series connecting rod bearings from ACL are a solid choice. They're designed to handle the increased stresses of performance builds and feature a 0.010 inch undersize to help you achieve proper clearances when working with a freshly machined crankshaft.

ACL has been making engine bearings for a long time, and these are well-built for demanding applications. The narrowed design helps ensure optimal oil clearance, which is critical for keeping your engine running cool and preventing premature wear under load. The inclusion of dowels means they'll seat correctly in the connecting rod, simplifying installation and ensuring they stay put.

This set is intended for performance builds where precise bearing clearance is key. Make sure to check your crankshaft journals for the correct size and condition before installation. Refer to the manufacturer's installation instructions for detailed guidance.