What is the main job of crankshaft main bearings?

Crankshaft main bearings sit between the crankshaft and the engine block. Their primary job is to support the crankshaft, allowing it to rotate smoothly while maintaining precise oil clearance. This reduces friction and wear on both the crankshaft and the block.

What does 'tri-metal construction' mean for these bearings?

Tri-metal construction refers to a bearing made of three distinct layers of material. Typically, this includes a steel backing for strength, a copper-lead alloy for load carrying, and a softer overlay like babbitt for conformability and embeddability. This layered approach offers a good balance of strength and wear resistance.

Are these bearings suitable for a performance rebuild?

Yes, ACL's tri-metal bearings are a popular choice for both stock and performance engine rebuilds. Their robust construction is designed to handle increased loads and stresses often found in modified or high-performance V8 engines.

ACL Engine Crankshaft Main Bearing Set 5M429A-30

Name: ACL Chevrolet V8 265-283-302-327 1955-67 Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-chevrolet-v8-265-283-302-327-1955-67-engine-crankshaft-main-bearing-set-t14-632418
Price: 32.00 USD
Availability: BackOrder

ACL Chevrolet V8 265-283-302-327 1955-67 Engine Crankshaft Main Bearing Set

$32.00

On Backorder

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

ACL Chevrolet V8 265-283-302-327 1955-67 Engine Crankshaft Main Bearing Set. Direct fit for classic V8s.

Key Features

Fits 1955-1967 Chevrolet V8 engines (265-283-302-327).
Tri-metal construction for improved durability and performance.
Designed to handle the stresses of classic V8 engines.
Helps ensure smooth crankshaft rotation and proper oil clearance.
Direct fit for many popular Chevrolet models of the era.

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Will this fit your vehicle?

Product Details

200,000 psi tensile strength puts these ACL main bearings well above stock hardware. If you're rebuilding a classic Chevrolet V8 from 1955 to 1967, like a 265, 283, 302, or 327, this set is designed to handle the demands of those engines. These bearings are crucial for keeping your crankshaft spinning smoothly within the engine block, and a good set makes a big difference in the longevity and performance of your rebuild.

ACL has been making engine bearings for a long time, and they know what it takes to build a solid set. These main bearings are made with a tri-metal construction, which is a popular choice for performance and durability. This means they have multiple layers of different materials, each chosen for its specific job – like reducing friction and handling load. This updated design helps them hold up better under stress compared to older bearing technologies.

When you're putting together a V8 engine, getting the main bearings right is key. This set is a direct fit for many popular Chevrolet models from the mid-50s to the late-60s. Make sure to check the fitment list to confirm it matches your specific vehicle. Proper installation is critical for any engine bearing; always refer to your vehicle's service manual for the correct procedures and torque specifications.