What does '.40mm oversized' mean for these main bearings?

This means the bearings are slightly larger than standard size by 0.40mm. They are intended for use when the engine's crankshaft journals have been machined undersize by 0.40mm during a rebuild to correct wear or damage.

What is trimetal construction?

Trimetal bearings have three layers: a steel backing for strength, a copper-lead alloy for load carrying, and a softer overlay like babbitt for conformability and embeddability. This construction is common in performance and heavy-duty applications.

Do these bearings come with installation instructions?

While this set includes the bearings, it's recommended to refer to the specific service manual for your vehicle's year and model for detailed installation procedures and proper torque specifications.

ACL 1967-1998 Chevy V8 267/305/327/350 .40mm Trimetal Oversized Main Bearing Set

Specifications

Brand: ACL
Part #: 5M909P-40
UPC: 9315726098011

ACL 1967-1998 Chevy V8 267/305/327/350 .40mm Trimetal Oversized Main Bearing Set

Name: ACL 1967-1998 Chevy V8 267/305/327/350 .40mm Trimetal Oversized Main Bearing Set
Brand: ACL
Price: 47.24 USD
Availability: InStock

$47.24

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1967-1998 Chevy V8 267/305/327/350 .40mm Trimetal Oversized Main Bearing Set by ACL. Fits Camaro, C10, Impala. Ensures proper crankshaft support.

Key Features

Fits 1967-1973 Chevrolet Camaro, 1969-1974 Chevrolet C10 Pickup, and 1962-1967 Chevrolet Impala.
Set includes .40mm oversized main bearings for use with a machined crankshaft.
Trimetal construction offers durability and good oil retention.
Designed for Chevrolet 267, 305, 327, and 350 V8 engines.
Covers a wide range of model years from 1967 to 1998.

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Fits these vehicles

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

Product Details

This set features a .40mm oversized dimension, which is crucial if your crankshaft has been machined undersize during a rebuild. The trimetal construction offers a good balance of strength and conformability, helping to absorb shock loads and maintain oil film. ACL has been making engine bearings for a long time, and this set is a well-built option for your 267, 305, 327, or 350 small-block Chevy. They fit a wide range of years, from 1967 all the way up to 1998, covering many popular applications like the Camaro, C10 pickup, and Impala.

When you're rebuilding an engine, getting the bearing clearances just right is critical for longevity and performance. This set is designed to provide that precise clearance when used with a .40mm undersized crankshaft. Make sure to check your crankshaft's journal size before ordering to ensure you get the correct bearing size for your rebuild.