What does it mean that these bearings are 0.030 inch undersize?

This means the bearings are designed to fit a crankshaft that has been machined down by 0.030 inches from its original factory size. This is common when a crankshaft has wear or surface imperfections that need to be removed during an engine rebuild.

What is trimetal construction?

Trimetal bearings use multiple layers of different materials, typically steel, copper-lead alloy, and a softer overlay like babbitt. This layered design helps them handle high loads and temperatures while providing good wear resistance and conformability to the crankshaft journal.

Do these bearings come with new rod bolts?

This set includes only the rod bearings. New rod bolts are typically recommended or required when rebuilding an engine, and they are usually sold separately.

Specifications

Brand: ACL
Part #: 8B663P-30
UPC: 9315726101742

ACL 1967-2007 Chevy V8 305/350/400 .30mm Oversized Trimetal Rod Bearing Set

Name: ACL 1967-2007 Chevy V8 305/350/400 .30mm Oversized Trimetal Rod Bearing Set
Brand: ACL
SKU: acl-acl-1967-2007-chevy-v8-305-350-400-30mm-oversized-trimetal-rod-bearing-set-t14-102627
Price: 44.18 USD
Availability: BackOrder

$44.18

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Fits 1967-1981 Chevy Camaro. ACL 1967-2007 Chevy V8 305/350/400 .30mm Oversized Trimetal Rod Bearing Set.

Key Features

Fits 1967-1981 Chevrolet Camaro, 1969-1981 and 1985-1996 Chevrolet Corvette, 1977-1985 Chevrolet Impala, and 1999-2004 Chevrolet Silverado 2500.
Designed for Chevy 305, 350, and 400 small-block V8 engines.
Bearings are 0.030 inches undersize for use with a machined crankshaft.
Trimetal construction offers durability and good load-carrying capacity.
Helps maintain proper oil clearance and lubrication for engine longevity.

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Will it fit your car?

About this part

Product Details

Doing an engine rebuild on your 1967-1981 Chevrolet Camaro and need to get the bottom end buttoned up? These ACL Trimetal Rod Bearings are a solid choice for your 305, 350, or 400 small-block Chevy. When you're machining the crankshaft, you often need to go slightly undersize to clean up any wear or imperfections. These bearings are made to fit a crankshaft that has been turned down by 0.030 inches, ensuring a proper fit and oil clearance.

ACL has been making engine bearings for a long time, and these are well-built with a trimetal construction. This means they have multiple layers of different materials, which helps them handle the loads and heat generated in a performance or daily driver engine. The precise sizing is crucial for proper oil flow and to prevent premature wear on both the bearings and the crankshaft journals. If your crank has been machined to a .030 undersize, these are the bearings you'll need to get everything back together right.