What does '0.020 undersize' mean for these bearings?

This means the bearings are manufactured to be 0.020 inches smaller in diameter than a standard, or 'stock', size bearing. They are used when the crankshaft journals have been machined down by 0.020 inches to remove wear or damage, or to achieve a specific bearing clearance.

What is tri-metal construction?

Tri-metal bearings feature three layers of material. Typically, this includes a steel backing for strength, a copper-lead alloy for load carrying capacity, and a thin overlay of babbitt (a soft alloy) for embeddability and to help maintain oil film.

Do these bearings come with assembly lube?

This set includes the connecting rod bearings only. It is highly recommended to use a quality engine assembly lubricant when installing these bearings to ensure proper oil film formation during initial startup.

Specifications

Brand: ACL
Part #: 8B743AO/S2-20

ACL IF STOCK=0CHECK 8B743P0/S2-20 - ACL AMERICA Engine Connecting Rod Bearing Set

Name: ACL IF STOCK=0CHECK 8B743P0/S2-20 - ACL AMERICA Engine Connecting Rod Bearing Set
Brand: ACL
SKU: acl-acl-if-stock-0check-8b743p0-s2-20-acl-america-engine-connecting-rod-bearing--t14-633058
Price: 21.83 USD
Availability: BackOrder

$21.83

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ACL Connecting Rod Bearing Set 8B743AO/S2-20. A well-built set for engine rebuilds.

Key Features

This is a set of connecting rod bearings for various Chevrolet and Excalibur vehicles.
The bearings are 0.020 inches undersize, intended for a machined crankshaft.
ACL uses a tri-metal construction for a balance of strength and conformability.
This bearing set is designed to handle the loads in a rebuilt engine.

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About this part

Product Details

Doing an engine rebuild on your classic Chevrolet or Excalibur? This ACL Connecting Rod Bearing Set is a solid option for getting your engine back in shape. Connecting rod bearings sit between the crankshaft and the connecting rod, allowing the rod to spin freely while handling the immense forces generated during combustion. When these wear out, you can experience knocking noises and, eventually, catastrophic engine failure.

ACL has been making engine bearings for a long time, and this set is built to meet the demands of a rebuilt engine. They use a tri-metal construction, which is a popular choice for performance and street applications because it offers good strength and embeddability. This means the bearing material can conform slightly to imperfections in the crankshaft, helping to maintain oil pressure and reduce wear. This particular set is sized at 0.020 inches undersize, meaning it's intended for a crankshaft that has been machined down by that amount to remove damage or to achieve a specific clearance.

When you're rebuilding an engine, getting the bearing clearances right is critical. Make sure to check the manufacturer's installation instructions for the correct oil clearance specifications and any specific assembly lube recommendations before installing these bearings.