What does 'standard size' mean for these bearings?

Standard size bearings are meant to be used with a crankshaft that is at its original factory dimensions. If your crankshaft has been machined undersize due to wear or repair, you would need a different size bearing set.

What is the advantage of tri-metal construction?

Tri-metal bearings combine a strong steel backing for rigidity, a copper-lead alloy layer for strength and heat dissipation, and a soft babbitt overlay for conformability and embeddability. This makes them well-suited for high-load, high-temperature performance engine applications.

Do these bearings come with assembly lube?

This kit includes the crankshaft main bearings only. It is recommended to use a high-quality engine assembly lubricant specifically designed for bearing surfaces during installation to ensure proper oil film formation and prevent damage.

Specifications

Brand: ACL
Part #: 5M1038HX-STD

ACL Chevrolet V8 400 Race Series Engine Crankshaft Main Bearing Set

Name: ACL Chevrolet V8 400 Race Series Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-chevrolet-v8-400-race-series-engine-crankshaft-main-bearing-set-t14-630516
Price: 105.13 USD
Availability: BackOrder

$105.13

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ACL Chevrolet V8 400 Race Series Engine Crankshaft Main Bearing Set. These standard size bearings are built for performance applications.

Key Features

Fits select 1967-1974 Pontiac and 1970-1971 Stutz vehicles.
ACL Race Series crankshaft main bearing set.
Standard size bearings for use with a standard or freshly machined crankshaft.
Tri-metal construction with steel backing, copper-lead alloy, and babbitt overlay.
Designed to handle higher loads and temperatures in performance applications.

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About this part

Product Details

You get a full set of crankshaft main bearings in this kit, which means one box handles the whole bottom end rebuild. These are the ACL Race Series bearings, built for Chevrolet V8 engines. If you're putting together a performance engine or rebuilding a classic, getting the right bearings is crucial for engine longevity and power delivery. These are standard size, so they're meant to be used with a crankshaft that hasn't been machined undersize.

ACL has been making engine bearings for a long time, and this Race Series set uses a tri-metal construction. This means they've got a strong steel backing, a copper-lead alloy intermediate layer, and a babbitt overlay. This combination is known for handling higher loads and temperatures that you'd find in a performance or racing engine. They're designed to maintain oil clearance even under stress, which helps protect your crankshaft and bearings from damage.

This set is designed to fit a range of Pontiac models from the late 60s and early 70s, as well as the Stutz Blackhawk from the early 70s. Make sure to check the fitment list to confirm compatibility with your specific vehicle. When installing, always follow the manufacturer's recommended procedures and use the correct assembly lube to ensure these bearings perform as they should.