What is the benefit of the CT-1 coating on these bearings?

The CT-1 coating is a dry film lubricant that helps reduce friction and wear, especially during critical engine startup and break-in periods. It provides an extra layer of protection before the engine oil fully circulates.

Are these bearings for a standard or undersized crankshaft?

These are standard size main bearings. They are intended for use with a crankshaft that is at its original factory size or has been machined back to standard specifications.

What other parts are typically needed when replacing main bearings?

When replacing main bearings, it's common practice to also replace the rod bearings, oil pump, oil filter, and potentially the crankshaft seals. Always refer to your engine's service manual for a complete list of recommended replacement parts during a rebuild.

ACL Chevy 265/283/302/327 Standard Size Main Bearing Set - CT-1 Coated

Specifications

Brand: ACL
Part #: 5M429HXC-STD
UPC: 9315726457849

ACL Chevy 265/283/302/327 Standard Size Main Bearing Set - CT-1 Coated

Name: ACL Chevy 265/283/302/327 Standard Size Main Bearing Set - CT-1 Coated
Brand: ACL
Price: 172.39 USD
Availability: InStock

$172.39

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ACL Chevy 265/283/302/327 standard size main bearing set with CT-1 coating.

Key Features

Fits 1955-1967 Chevrolet and 1960-1967 GMC vehicles with 265, 283, 302, or 327 cubic inch V8 engines.
Features ACL's CT-1 dry film lubricant coating for improved startup protection and reduced friction.
Standard size bearings designed for use with a factory-spec or freshly machined standard size crankshaft.
Well-built main bearing set for classic Chevrolet V8 engine rebuilding.
Designed to meet the demands of performance and daily driving applications.

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Will this fit your vehicle?

Product Details

When you're rebuilding a classic Chevy V8 like the 265, 283, 302, or 327, the main bearings are critical for keeping that crankshaft spinning smoothly. These standard size main bearing sets from ACL are built with their CT-1 coating, which is a dry film lubricant designed to reduce friction and wear, especially during initial engine startup and break-in periods. This coating helps protect the bearing surfaces before your engine oil fully circulates, which is a common stress point for new or rebuilt engines.

ACL has been making engine bearings for a long time, and this set is a solid option for anyone looking to get their classic Chevy engine back in shape. They're made to fit standard size crankshaft journals, so if your crank hasn't been ground undersize, these will be a direct fit. The CT-1 coating is a notable feature that adds an extra layer of protection, giving you more confidence as you put your engine together.

This set is designed to fit a wide range of classic Chevrolet and GMC vehicles from the mid-50s through the late 60s, covering many popular V8 applications. Make sure to check the fitment list to confirm it matches your specific truck or car. When installing, always follow the manufacturer's recommended bearing clearance and lubrication procedures to ensure the longevity of your rebuild.