What does '.10mm oversized' mean for these main bearings?

This means the bearings are manufactured to be 0.10 millimeters larger in diameter than a standard-sized bearing. This is used when the crankshaft journals have been machined undersize to account for wear or during a performance rebuild.

What is the material of these ACL main bearings?

These bearings are made from a tri-metal material. This construction is known for its durability and ability to handle the high loads and temperatures found in V8 engines, while also providing good conformability to the crankshaft.

Do these bearings come with installation hardware?

This set includes the main bearings only. Installation hardware, such as main bearing cap bolts or seals, are typically sold separately. Always refer to your vehicle's service manual for a complete list of parts needed for the job.

ACL Main Bearing Set for Chevy V8 265-327 .10mm Oversize 5M4

Name: ACL 1955-1967 Chevy V8 265/283/302/327 .10mm Oversized Main Bearing Set
Brand: ACL
Price: 57.96 USD
Availability: InStock

ACL 1955-1967 Chevy V8 265/283/302/327 .10mm Oversized Main Bearing Set

$57.96

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ACL 1955-1967 Chevy V8 265/283/302/327 .10mm Oversized Main Bearing Set

Key Features

Fits 1955-1967 Chevrolet V8 engines (265, 283, 302, 327 cubic inch).
Main bearing set is .10mm oversized for crankshafts ground undersize.
Tri-metal material construction offers strength and conformability.
Designed to support the crankshaft and maintain proper oil clearance.
Suitable for classic Chevrolet Bel Air, Impala, Camaro, Corvette, and more.

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Will this fit your vehicle?

Product Details

ACL has been making engine bearings for decades, and this main bearing set for your 1955-1967 Chevy V8 is one of their staples. These bearings are crucial for supporting the crankshaft and ensuring it spins smoothly within the engine block. When rebuilding or repairing an engine, especially one that's seen a lot of miles, replacing the main bearings is a common and important step to restore proper oil clearance and reduce friction.

This set is .10mm oversized, which is important if your crankshaft journals have been ground undersize during a previous rebuild or to correct wear. ACL uses a tri-metal material construction, which is well-known for its strength and ability to handle the high loads found in V8 engines. This material provides a good balance of wear resistance and conformability, helping to maintain consistent oil pressure across the bearing surface.

When installing these bearings, it's critical to ensure your crankshaft journals are clean and within the specified size tolerance. Always refer to your vehicle's service manual for the correct installation procedures and torque specifications. This set is designed to fit a range of Chevy V8 engines from the mid-50s through the late 60s, making it a popular choice for classic truck and car restorations.