What is the purpose of the narrowed bearing design?

The 0.080 inch narrowing on these bearings increases the clearance between the bearing and the crankshaft's fillet radius. This modification is common in racing to improve oil flow to the bearing and reduce the stress on the bearing material at that critical point.

Are these bearings suitable for a daily driver?

While these are well-built bearings, the Race Series is primarily designed for performance and racing applications. For a standard daily driver, a different series of bearings might be more appropriate, but these will certainly function if installed correctly.

What is the construction of these ACL Race Series bearings?

These bearings utilize a tri-metal construction. This is a popular choice for performance bearings, offering a strong yet conformable surface that can handle high loads and temperatures.

Specifications

Brand: ACL
Part #: 5M829HN-STD
UPC: 9315726451144

ACL Chevrolet V8 396/402/427/454 Race Series Standard Size 0.080in Narrowed Main Bearing Set

Name: ACL Chevrolet V8 396/402/427/454 Race Series Standard Size 0.080in Narrowed Main Bearing Set
Brand: ACL
SKU: acl-acl-chevrolet-v8-396-402-427-454-race-series-standard-size-0-080in-narrowed--t14-206752
Price: 142.46 USD
Availability: BackOrder

$142.46

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Key Features

Fits 51+ Chevrolet and GMC V8 engines including 396, 402, 427, and 454 cubic inch displacements.
Race Series bearings feature a tri-metal construction for improved performance and durability.
Standard size bearings fit a factory-spec crankshaft.
Narrowed 0.080 inches to increase clearance at the crank fillet radius, aiding oil flow.
Designed for high-performance and racing applications.

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About this part

Product Details

ACL has been making engine bearings for decades, and this Race Series main bearing set for your Chevrolet V8 is one of their staples. These bearings are built for performance applications, helping to keep your crankshaft supported under demanding conditions. They are a standard size, meaning they fit a factory-spec crankshaft, but they are narrowed by 0.080 inches. This narrowing is a common modification in racing to increase the clearance between the bearing and the crank fillet radius, which helps with oil flow and reduces the risk of bearing spin.

The Race Series from ACL uses a tri-metal construction, which is a well-known standard for high-performance bearings. This construction offers a good balance of strength and conformability, allowing the bearing to adapt to slight imperfections in the crankshaft journal while still providing solid support. If you're building a performance V8 for your classic Chevrolet, like a Chevelle, Impala, or Camaro, these bearings are a solid choice for the bottom end.

When installing main bearings, it's crucial to ensure your crankshaft journals are clean and within spec, and that you use the correct assembly lube. Always refer to your engine's service manual for the proper installation procedures and torque specifications.