What does '0.030 inch undersize' mean for these bearings?

This means the bearings are designed to fit crankshaft journals that have been machined down by 0.030 inches from their original size. This is a common practice during engine rebuilding to correct wear or out-of-round conditions on the crankshaft.

What other parts are typically needed when replacing connecting rod bearings?

When replacing connecting rod bearings, it's standard practice to also replace the main bearings, piston rings, and gaskets as part of a complete engine rebuild. You'll also need assembly lube and potentially new connecting rod bolts.

How do I ensure these bearings are installed correctly?

Proper installation involves meticulous cleaning of all mating surfaces, verifying the crankshaft journal size matches the bearing's undersize specification, and applying a quality assembly lubricant to the bearing surfaces and crankshaft journals before assembly.

Specifications

Brand: ACL
Part #: 6B745P-30

ACL Chevrolet 6 194-230-250ci 1962-84 Engine Connecting Rod Bearing Set

Name: ACL Chevrolet 6 194-230-250ci 1962-84 Engine Connecting Rod Bearing Set
Brand: ACL
SKU: acl-acl-chevrolet-6-194-230-250ci-1962-84-engine-connecting-rod-bearing-set-t14-633008
Price: 15.77 USD
Availability: BackOrder

$15.77

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1958-1972 Chevrolet Biscayne connecting rod bearing set by ACL. Fits 6-cylinder 194-250ci engines. Essential for engine rebuilds.

Key Features

Fits 1958-1972 Chevrolet Biscayne.
Also fits Chevrolet C10 (1975-1984), Malibu (1964-1967), and Nova (1969-1974).
Designed for Chevrolet 6-cylinder engines with 194, 230, and 250ci displacements.
This is a 0.030 inch undersize bearing set, requiring machined crankshaft journals.
Provides essential oil clearance for connecting rod and crankshaft rotation.
From ACL, a well-known manufacturer of engine bearings.

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About this part

Product Details

Doing an engine rebuild on your 1958-1972 Chevrolet Biscayne? If you're working on a 6-cylinder engine with a 194, 230, or 250 cubic inch displacement, this connecting rod bearing set from ACL is a key component. These bearings sit between the connecting rod and the crankshaft, allowing the rod to rotate smoothly while handling the immense forces generated during combustion. Replacing them is a critical step in any engine overhaul to ensure proper oil clearance and prevent premature wear.

ACL has been making engine bearings for a long time, and this set is built to meet the demands of these classic inline-six engines. They're designed to provide the correct oil clearance, which is crucial for lubrication and cooling. When you're putting an engine back together, getting these clearances right is what separates a smooth-running motor from one that won't last. This set is a solid option for anyone looking to restore or rebuild their Chevrolet inline-six.

When installing these bearings, make sure to clean the crankshaft journals and connecting rod big ends thoroughly. It's also important to use the correct assembly lube to help protect the bearing surfaces during initial startup. This set is specifically for the 0.030 inch undersize, so be sure your crankshaft journals have been machined to this specification.