What does the 0.010 inch undersize mean for these bearings?

The 0.010 inch undersize indicates that these bearings are intended for use with a crankshaft that has been machined down by 0.010 inches. This is a common practice during engine rebuilding to correct wear or achieve specific bearing clearances.

Are these bearings suitable for a stock engine rebuild?

While these are Race Series bearings designed for higher performance, their robust construction can also be beneficial for a stock rebuild, especially if the engine sees heavy use. Ensure your crankshaft is in good condition and properly measured for the 0.010 inch undersize.

What is tri-metal construction?

Tri-metal construction refers to bearings made with three layers of material. Typically, this involves a steel backing for strength, a bronze or aluminum alloy layer for strength and heat dissipation, and a softer overlay like babbitt for conformability and to reduce friction against the crankshaft.

ACL Engine Crankshaft Main Bearing Set 5M1432H-10

Name: ACL Ford V8 351M-351W-400 Race Series Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-ford-v8-351m-351w-400-race-series-engine-crankshaft-main-bearing-set-t14-630987
Price: 134.73 USD
Availability: BackOrder

ACL Ford V8 351M-351W-400 Race Series Engine Crankshaft Main Bearing Set

$134.73

On Backorder

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

ACL Race Series main bearing set for Ford 351M, 351W, and 400 V8 engines. Direct fit.

Key Features

Fits many Ford V8 351M, 351W, and 400 engines.
Race Series bearings feature a special overlay for improved load and temperature handling.
Tri-metal construction offers a balance of strength and conformability.
0.010 inch undersize for use with machined crankshafts.
Designed for performance applications.

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Will this fit your vehicle?

Product Details

When you're building a Ford V8 with the 351M, 351W, or 400 engine, you need bearings that can handle the demands of performance. ACL's Race Series main bearings are built with a special overlay that's designed to withstand higher loads and temperatures than standard bearings. This means they're a solid choice for engines that see more than just daily driving.

These bearings feature a tri-metal construction, which is a popular choice for performance applications because it offers a good balance of strength and conformability. This helps them seat well against the crankshaft and maintain oil pressure, even under stress. The 0.010 inch undersize means they're intended for crankshafts that have been machined down to compensate for wear or to achieve specific clearances. Make sure your crankshaft has been properly measured and machined to this size before installation.

This set includes the main bearings needed for your Ford V8. If you're rebuilding your engine for performance or just need to replace worn bearings, these ACL Race Series bearings are a well-built option that offers improved durability for your 351M, 351W, or 400 engine.