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

This means the bearings are slightly larger in diameter than standard. They are intended for use when the engine's crankshaft has been machined down by 0.40mm to correct wear or achieve specific clearances during an engine rebuild.

Do these bearings come with installation instructions?

While these bearings are designed for a direct fit, it's always recommended to consult your vehicle's specific service manual for detailed installation procedures and critical clearance specifications.

What is the typical application for an oversized bearing set like this?

Oversized bearings are typically used during an engine rebuild when the crankshaft has been ground undersize to remove wear or damage. This allows the engine to be brought back to factory specifications or a desired performance clearance.

ACL Main Bearing Set .40mm Oversize for Chevy V8 265-327 5M4

Name: ACL 1955-1967 Chevy V8 265/283/302/327 .40mm Oversized Main Bearing Set
Brand: ACL
Price: 57.96 USD
Availability: InStock

ACL 1955-1967 Chevy V8 265/283/302/327 .40mm Oversized Main Bearing Set

$57.96

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ACL main bearing set for 1955-1967 Chevy V8 265/283/302/327 engines. .40mm oversize.

Key Features

Fits 1955-1967 Chevy V8 engines with 265, 283, 302, and 327 cubic inch displacements.
Main bearing set is .40mm oversized for use with a machined crankshaft.
Well-built construction from ACL, a long-standing manufacturer of engine components.
Designed to help restore proper oil clearance and pressure in worn engines.
Includes main bearings for a complete set.

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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 designed to fit engines with displacements from 265 cubic inches up to 327 cubic inches. This particular set is .40mm oversized, meaning it's intended for crankshafts that have been machined down by .40mm to account for wear or to achieve a specific clearance.

When you're rebuilding or repairing a classic Chevy V8, getting the bearing clearances right is crucial for oil pressure and engine longevity. ACL uses well-built materials and manufacturing processes to ensure these bearings meet the needs of performance and daily drivers alike. The .40mm oversize is a common size for crankshafts that have seen significant use and require a regrind to bring them back into spec. Proper installation, including thorough cleaning of the crankshaft and block, is key to achieving optimal oil pressure and smooth operation.

This set includes the main bearings needed for your engine. Always refer to your vehicle's specific service manual for detailed installation instructions and recommended bearing clearances.