What does '0.040 inch undersize' mean for these bearings?

This means the bearings are manufactured to fit a crankshaft that has been machined down by 0.040 inches. This is a common practice when rebuilding an engine to correct for wear on the crankshaft journals.

What is the main function of crankshaft main bearings?

Main bearings support the crankshaft within the engine block. They create a low-friction surface that allows the heavy crankshaft to rotate smoothly while carrying the load from combustion and piston movement.

Do I need to replace anything else when installing main bearings?

When replacing main bearings, it's standard practice to also replace the connecting rod bearings (also known as rod bearings). You should also ensure you have new main bearing cap bolts and follow the manufacturer's torque specifications precisely.

Specifications

Brand: ACL
Part #: 5M909A-40

ACL Chevrolet V8 267-305-327-350 1967-98 Engine Crankshaft Main Bearing Set

Name: ACL Chevrolet V8 267-305-327-350 1967-98 Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-chevrolet-v8-267-305-327-350-1967-98-engine-crankshaft-main-bearing-set-t14-630803
Price: 26.48 USD
Availability: BackOrder

$26.48

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Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 1967-1973 Chevrolet Camaro. ACL V8 engine crankshaft main bearing set for reliable engine starts.

Key Features

Fits 1967-1973 Chevrolet Camaro, 1969-1974 Chevrolet C10 Pickup, and 1962-1967 Chevrolet Impala.
Designed for Chevrolet V8 engines including 267, 305, 327, and 350 cubic inch displacements.
Main bearings allow the crankshaft to spin freely while supporting its weight.
This is a 0.040 inch undersize bearing set, intended for use with a machined crankshaft.
Helps maintain proper oil pressure and reduce engine friction.
Durable construction for long-lasting engine performance.

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About this part

Product Details

This ACL main bearing set is built to keep your Chevrolet V8 engine running smoothly. These bearings sit between the crankshaft and the engine block, allowing the heavy crankshaft to spin freely while supporting its weight. Over time, these bearings can wear down, leading to increased friction, oil pressure loss, and potential engine damage. This set is designed for Chevrolet V8 engines ranging from 267 to 350 cubic inches, covering a wide range of popular models from 1967 through 1998.

When you're rebuilding an engine or addressing oil pressure issues, a fresh set of main bearings is a critical step. This particular set is sized at 0.040 inches undersize, meaning it's intended for crankshafts that have been machined down by 0.040 inches to correct for wear or damage. Make sure to confirm your crankshaft's journal size before ordering.