What does '.20mm undersize' mean for these main bearings?

This means the bearings are manufactured to be slightly smaller than the original factory size by 0.20 millimeters. They are intended for use when the engine's crankshaft journals have been ground down by this amount to remove wear or imperfections.

What is Trimetal construction?

Trimetal bearings use three layers: a steel backing for strength, a copper-alloy intermediate layer for heat dissipation and embeddability, and a thin overlay of babbitt (a soft alloy) for the actual bearing surface that contacts the crankshaft.

Do these bearings come with installation instructions?

While these bearings are designed as a direct replacement, it is always recommended to consult your vehicle's specific service manual for detailed installation procedures, torque specifications, and proper oil clearances.

ACL 1967-1998 Chevy V8 267/305/327/350 .20mm Trimetal Oversized Main Bearing Set

Specifications

Brand: ACL
Part #: 5M909P-20
UPC: 9315726097991

ACL 1967-1998 Chevy V8 267/305/327/350 .20mm Trimetal Oversized Main Bearing Set

Name: ACL 1967-1998 Chevy V8 267/305/327/350 .20mm Trimetal Oversized Main Bearing Set
Brand: ACL
Price: 47.24 USD
Availability: InStock

$47.24

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Key Features

Fits 1967-1973 Chevrolet Camaro, 1969-1974 Chevrolet C10 Pickup, and 1962-1967 Chevrolet Impala.
Designed for Chevy V8 engines including 267, 305, 327, and 350 cubic inch displacements.
Features a .20mm undersize, intended for use with a crankshaft machined to this dimension.
Constructed with a Trimetal material for a reliable balance of strength and conformability.
Helps manage oil flow and cushion the crankshaft within the engine block.

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Fits these vehicles

Chevrolet C10 Pickup 1969-1974
Chevrolet Camaro 1967-1973
Chevrolet Impala 1962-1967

Product Details

When you're rebuilding a Chevy V8 like the 267, 305, 327, or 350, getting the main bearings right is crucial for engine longevity. These ACL Trimetal main bearings are .20mm undersize, meaning they're designed to be used when the crankshaft journals have been machined down by .020 inches to clean up any wear or damage. The trimetal construction offers a good balance of strength and conformability, helping to cushion the crankshaft and manage oil flow effectively.

ACL has been making engine bearings for a long time, and their trimetal design is a popular choice for many engine builders. This set is built to handle the demands of these classic Chevy V8s, providing a solid foundation for your rebuild. Because they are oversized by .20mm, they are specifically intended for use with a crankshaft that has been ground to this dimension. Make sure your machine shop has accounted for this size when preparing your crankshaft.

This set includes the main bearings needed for your engine rebuild. Always refer to your vehicle's specific service manual for detailed installation procedures and torque specifications.