What is the main purpose of crankshaft main bearings?

Crankshaft main bearings sit between the crankshaft and the engine block. Their primary job is to support the crankshaft, reduce friction, and allow it to rotate smoothly while maintaining precise oil clearances.

Are these bearings suitable for a stock engine rebuild?

Yes, these ACL Race Series bearings are a solid option for both stock and performance rebuilds. They are standard size and designed to fit factory specifications, offering improved durability over stock bearings.

What is the difference between standard (STD) and undersize bearings?

Standard (STD) bearings are meant to be used when the crankshaft journals are within factory specifications. Undersize bearings (like -010 or -020) are used when the crankshaft has been machined down to correct for wear or damage.

ACL Engine Crankshaft Main Bearing Set 5M429HX-STD

Name: ACL Chevrolet V8 265-283-302-327 Race Series Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-chevrolet-v8-265-283-302-327-race-series-engine-crankshaft-main-bearing--t14-631189
Price: 128.81 USD
Availability: BackOrder

ACL Chevrolet V8 265-283-302-327 Race Series Engine Crankshaft Main Bearing Set

$128.81

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 Race Series Engine Crankshaft Main Bearing Set.

Key Features

Fits 1955-1967 Chevrolet and GMC V8 engines with 265-327ci displacement.
ACL Race Series crankshaft main bearing set.
Standard (STD) size for use with factory-spec crankshafts.
Well-built overlay material offers strength and wear resistance.
Designed for performance engine rebuilds.

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Will this fit your vehicle?

Product Details

Rebuilding the bottom end of your classic Chevrolet V8? Whether you're working on a 265, 283, 302, or 327 cubic inch engine, these ACL Race Series crankshaft main bearings are built to handle the demands of performance builds. They're designed to provide a solid foundation for your rotating assembly, ensuring proper clearances and oil flow for longevity.

ACL has been making engine bearings for a long time, and this Race Series set uses a well-built overlay material that's known for its strength and wear resistance. The standard size (STD) means they're meant to be used with a factory-spec crankshaft, and they're designed to fit right into the factory main caps. If you're looking for a reliable bearing for your performance rebuild, these are a popular choice among engine builders.

When you're putting your engine back together, getting the main bearing clearances just right is critical. Make sure to check your crankshaft and block for straightness and wear before installing these bearings. Refer to your vehicle's service manual for the correct installation procedures and torque specifications.