What is the difference between standard and undersize/oversize bearings?

Standard bearings are designed to fit a crankshaft journal that is within the manufacturer's original factory specifications. If your crankshaft has been worn down and machined to a smaller size, you'll need undersize bearings (e.g., -010, -020). Conversely, if it's been built up or machined to a larger size, you'll need oversize bearings.

What is included in this main bearing set?

This set includes the main bearings required for a complete engine rebuild for the specified Buick V6 engines. It is designed to replace all the main bearings on the crankshaft.

Do I need any special tools to install these main bearings?

While the bearings themselves are a direct fit, proper installation requires careful attention to crankshaft cleanliness and journal condition. You will need a torque wrench to ensure the main caps are tightened to the manufacturer's specifications, as found in your vehicle's service manual.

Specifications

Brand: ACL
Part #: 4M960P-40

ACL Buick V6 181-196-231-252 1964-90 Engine Crankshaft Main Bearing Set

Name: ACL Buick V6 181-196-231-252 1964-90 Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-buick-v6-181-196-231-252-1964-90-engine-crankshaft-main-bearing-set-t14-632203
Price: 16.06 USD
Availability: BackOrder

$16.06

On Backorder

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

Fits 1975-1977 Buick Regal. ACL Main Bearing Set for Buick V6 engines (181-252ci). Direct fit.

Key Features

Fits 1975-1977 Buick Regal.
Designed for Buick V6 engines with displacements from 181ci to 252ci.
Covers engine years 1964-1990, including specific applications like the 231ci 3.8L, 3800 Type C, and 225ci.
Features ACL's specialized overlay material for improved strength and bonding.
Built to resist wear and maintain shape under engine pressure.
Standard size bearings for factory-spec crankshaft journals.

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About this part

Product Details

When you're rebuilding a Buick V6 engine, especially for your 1975-1977 Regal, getting the crankshaft bearings right is crucial. These ACL main bearings are built to handle the demands of your engine, ensuring smooth operation and proper crankshaft support. They are designed to fit Buick V6 engines with displacements from 181ci up to 252ci, covering a wide range of years from 1964 through 1990, including specific applications like the 231ci 3.8L, the 3800 Type C, and the 225ci engines.

ACL uses a specialized overlay material that's known for its strength and ability to bond well with the bearing's steel backing. This construction helps these bearings resist wear and maintain their shape under the high pressures found in the crankcase. The 4M960P-40 set is specifically sized for a standard crankshaft journal, meaning it's a direct replacement for your original bearings if your crank is still within factory specifications. If your crankshaft has been machined, you'll need to check the specific undersize or oversize needed and select the corresponding ACL bearing set.

When installing these bearings, it's important to ensure your crankshaft journals are clean and within the correct size tolerance. Refer to your vehicle's service manual for the proper installation procedure and torque specifications to get the best performance and longevity out of your new ACL main bearings.