What is the difference between standard size and undersize bearings?

Standard size bearings are meant for crankshafts that are still within their original factory specifications. Undersize bearings are used when a crankshaft has been machined down (ground) to correct wear or damage, requiring a bearing with a slightly smaller inner diameter to maintain proper oil clearance.

Do these bearings come with assembly lube?

This set includes the main bearings themselves. It is highly recommended to use a quality engine assembly lube when installing these bearings to ensure proper lubrication during initial startup and break-in.

What engine models do these ACL bearings fit?

These ACL main bearings are designed for Nissan L-series 6-cylinder engines, specifically the L20 (1998cc), L24 (2393cc), and L28 (2753cc) variants found in models like the Datsun 240Z, 260Z, 280Z, 280ZX, 810, and early Maxima.

ACL Nissan L20/L24/L28 1998cc/2393cc/2753cc 6cyl Standard Size High Performance Main Bearing Set

Specifications

Brand: ACL
Part #: 7M1172H-STD
UPC: 9315726453704

ACL Nissan L20/L24/L28 1998cc/2393cc/2753cc 6cyl Standard Size High Performance Main Bearing Set

Name: ACL Nissan L20/L24/L28 1998cc/2393cc/2753cc 6cyl Standard Size High Performance Main Bearing Set
Brand: ACL
Price: 245.30 USD
Availability: InStock

$245.30

On Backorder — Expected to ship by Apr 8, 2026

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

ACL High Performance Main Bearing Set for Nissan L20/L24/L28 6cyl engines. Well-built for improved engine reliability.

Key Features

Fits Nissan L20, L24, and L28 engines.
Standard size bearings for use with factory-spec or freshly machined crankshafts.
Designed for high-performance applications, offering improved reliability.
Well-built to precise tolerances for a solid engine foundation.
Suitable for 1998cc, 2393cc, and 2753cc 6-cylinder engine displacements.
Direct fit for Datsun/Nissan 240Z, 260Z, 280Z, 280ZX, 810, and Maxima models within specified years.

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Will this fit your vehicle?

Product Details

You get a full set of high-performance main bearings in this kit, which means you can rebuild your Nissan L-series engine with confidence. These ACL bearings are built to handle the demands of performance engines, whether you're restoring a classic Z-car or building a more powerful street machine. They are designed to provide a solid foundation for your engine's rotating assembly, ensuring proper oil clearance and support for the crankshaft.

ACL has a solid reputation for making well-built engine components, and these main bearings are no exception. They are manufactured to precise tolerances, ensuring they fit right and perform reliably. The standard size means they are intended for use with a crankshaft that has not been machined undersize, making them a straightforward replacement for a stock rebuild or a performance build where the crank is still within factory specifications. Proper oil clearance is critical for engine longevity, and these bearings are designed to maintain that crucial gap.

This set is specifically for Nissan L20 (1998cc), L24 (2393cc), and L28 (2753cc) 6-cylinder engines. You'll find these in popular models like the Datsun 240Z, 260Z, 280Z, 280ZX, and early Maxima and 810 models. Make sure your engine code matches before ordering, as these are a specific fit for that engine family.