What does it mean that these bearings are 0.20mm undersize?

This means the bearings are slightly smaller than standard size. They are intended for use when the crankshaft's main journals have been machined down by 0.20mm to remove wear or prepare for a rebuild. You must measure your crankshaft journals to confirm they have been machined to this specific size.

What is the main function of main bearings in an engine?

Main bearings support the crankshaft within the engine block. They create a precise oil clearance that allows the crankshaft to rotate smoothly while maintaining adequate lubrication, reducing friction and wear.

Does this set include all the main bearings needed for my engine?

Yes, this ACL 5M429P-20 set includes the main bearings required for the specified Chevrolet V8 engines. Always refer to your vehicle's service manual for the exact number of bearings and installation procedures.

ACL 1955-1967 Chevy V8 265/283/302/327 .20mm Oversized Main Bearing Set

Specifications

Brand: ACL
Part #: 5M429P-20
UPC: 9315726099643

ACL 1955-1967 Chevy V8 265/283/302/327 .20mm Oversized Main Bearing Set

Name: ACL 1955-1967 Chevy V8 265/283/302/327 .20mm Oversized Main Bearing Set
Brand: ACL
Price: 57.96 USD
Availability: InStock

$57.96

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ACL .20mm oversize main bearing set for 1955-1967 Chevy V8 265/283/302/327 engines.

Key Features

Fits 1955-1967 Chevrolet V8 engines with 265, 283, 302, or 327 cubic inch displacements.
Main bearings are 0.20mm undersize, intended for use on crankshafts machined to this specification.
Ensures proper oil clearance for lubrication and reduced friction in the engine's bottom end.
Well-built by ACL, a company with a long history in engine bearing manufacturing.
Designed to handle the operational loads and temperatures of classic V8 engines.

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Will this fit your vehicle?

Product Details

Already running a rebuilt or performance V8 in your classic Chevy? This ACL main bearing set is the next piece of the puzzle for a solid bottom end. These bearings are designed to be installed when the crankshaft journals have been machined down by 0.20mm (about 0.008 inches) to clean them up or to account for wear. They are crucial for ensuring proper oil clearance between the crankshaft and the engine block, which is vital for lubrication and longevity, especially in modified or high-performance applications.

ACL has been making engine bearings for a long time, and this set uses their experience to offer a well-built component. The material is chosen to handle the loads and temperatures found in these classic Chevy V8s. When you're rebuilding an engine, getting the main bearing clearance just right is critical. These bearings are made to the correct specifications for that 0.20mm undersize, helping you achieve that precise clearance needed for optimal oil flow and reduced friction.

This set includes the main bearings for your engine. Make sure to check your crankshaft's condition and measure the journals to confirm they have been machined to the 0.20mm undersize before ordering. Proper installation, including cleaning and oiling the bearings, is essential for their performance and lifespan.