What does 'Trimetal' construction mean for these bearings?

Trimetal construction refers to the layered design of the bearing. It typically includes a steel backing for strength, a copper-lead alloy layer to help dissipate heat and embed debris, and a soft babbitt overlay that forms the actual running surface against the crankshaft.

Do I need to machine my crankshaft to use these standard size bearings?

These are standard size bearings, meaning they are designed to fit crankshaft journals that are still within the factory's original specifications. If your crankshaft has been previously machined or shows significant wear, you may need to measure the journals and consider an undersize bearing set.

What other engine components might I need when replacing main bearings?

When replacing main bearings, it's often recommended to also replace the connecting rod bearings (also known as rod bearings) to ensure consistent wear patterns. You'll also need new engine oil and an oil filter, and it's good practice to have a service manual for correct installation procedures and torque specs.

ACL 1967-1998 Chevy V8 267/305/327/350 Trimetal Standard Size Main Bearing Set

Specifications

Brand: ACL
Part #: 5M909P-STD
UPC: 9315726088791

ACL 1967-1998 Chevy V8 267/305/327/350 Trimetal Standard Size Main Bearing Set

Name: ACL 1967-1998 Chevy V8 267/305/327/350 Trimetal Standard Size Main Bearing Set
Brand: ACL
Price: 47.24 USD
Availability: InStock

$47.24

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Fits 1967-1973 Chevy Camaro. ACL Trimetal main bearings for 267/305/327/350 V8s. Standard size.

Key Features

Fits 1967-1973 Chevrolet Camaro, 1969-1974 Chevrolet C10 Pickup, and 1962-1967 Chevrolet Impala.
Designed for Chevy V8 engines with 267, 305, 327, and 350 cubic inch displacements.
Standard size bearings fit crankshaft journals within factory specifications.
Trimetal construction offers a strong steel backing, a heat-dissipating copper-lead layer, and a durable babbitt bearing surface.
Helps manage heat and wear for reliable engine operation.
Direct replacement for stock main bearings.

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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 or refreshing the heart of your classic Chevy, the main bearings are critical. These ACL Trimetal main bearings are built for Chevy V8s from 1967 through 1998, covering popular displacements like the 267, 305, 327, and 350 cubic inch engines. They are a standard size, meaning they're designed to replace your original bearings without needing any machine work, assuming your crankshaft journals are still within factory specifications.

ACL uses a Trimetal construction, which is a well-known standard for performance and durability in engine bearings. This design typically involves a steel backing for strength, a copper-lead alloy layer for embeddability and heat dissipation, and a thin overlay of babbitt (a soft metal alloy) for the actual bearing surface. This layered approach helps the bearing conform to the crankshaft journal while managing heat and wear effectively, making them a solid choice for street performance or a reliable daily driver.

This set is designed as a direct replacement for your stock main bearings. If your crankshaft journals have been previously machined or show significant wear, you may need to check the journal size and consider an undersize bearing set. Always refer to your vehicle's service manual for proper installation procedures and torque specifications.