What is the main purpose of crankshaft main bearings?

Crankshaft main bearings create a low-friction surface for the crankshaft to rotate within the engine block. They support the crankshaft and help maintain proper oil clearance, which is essential for engine health and performance.

Are these bearings undersized or oversized?

This is a standard size main bearing set. It is designed for use with a crankshaft that is within factory specifications. Always check your crankshaft journals for wear or damage before installation.

What should I do before installing these main bearings?

Before installing, ensure the crankshaft journals are clean and free of debris. It's also important to verify that the crankshaft is within factory specifications for diameter and roundness. Refer to the manufacturer's installation instructions for detailed steps and torque specifications.

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Est. 1957

Specifications

Brand: ACL
Part #: 5M981A-40

ACL Ford Prod. V8 351M-351W 1969-76 Engine Crankshaft Main Bearing Set

Name: ACL Ford Prod. V8 351M-351W 1969-76 Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-ford-prod-v8-351m-351w-1969-76-engine-crankshaft-main-bearing-set-t14-632507
Price: 40.81 USD
Availability: BackOrder

$40.81

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Fits 1969-1974 Ford Country Sedan. ACL main bearing set for 351M-351W V8 engines. Ensures proper crankshaft support.

Key Features

Fits 1969-1974 Ford Country Sedan.
Designed for Ford 351M and 351W V8 engines.
Main bearing set for crankshaft support.
Well-built for reliable engine operation.
Part number 5M981A-40.

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About this part

Product Details

Already running a built 351M or 351W in your 1969-1974 Ford Country Sedan? This main bearing set from ACL is the next piece of the puzzle for a solid engine build. These bearings sit between the crankshaft and the engine block, providing a smooth, low-friction surface for the crank to rotate on. Getting this right is crucial for engine longevity and performance, especially when you're pushing the limits of a classic V8.

ACL has been making engine bearings for a long time, and this set is well-built for the job. They're designed to handle the pressures and heat generated by a performance V8. When you're installing these, make sure your crankshaft journals are clean and within spec, and always follow the manufacturer's recommended torque sequence for the main caps. It’s a critical step for ensuring these bearings do their job correctly and last.