What does '0.25mm undersize' mean for these bearings?

This means the inner diameter of the bearing is 0.25mm smaller than a standard size bearing. This is typically used when the engine's crankshaft journals have been machined down (ground) to a smaller size during a rebuild to remove imperfections or to prepare for new bearings.

Are these bearings suitable for a stock engine rebuild?

While these are high-performance bearings, they can be used in a stock rebuild if the crankshaft journals are in good condition and measured to be standard size, or if they have been professionally ground to accept a 0.25mm undersize bearing. For a stock rebuild without crankshaft machining, you would typically need a standard size bearing.

What is the advantage of ACL's multi-layer bearing material?

ACL's multi-layer construction uses a strong overlay on top of the base material. This design is intended to provide increased strength and fatigue resistance, helping the bearings withstand higher loads and temperatures commonly found in performance or heavily used engines.

ACL Nissan L20/L24/L28 1998cc/2393cc/2753cc 6cyl 0.25 Oversized High Performance Main Bearing Set

Specifications

Brand: ACL
Part #: 7M1172H-.25
UPC: 9315726453742

ACL Nissan L20/L24/L28 1998cc/2393cc/2753cc 6cyl 0.25 Oversized High Performance Main Bearing Set

Name: ACL Nissan L20/L24/L28 1998cc/2393cc/2753cc 6cyl 0.25 Oversized High Performance Main Bearing Set
Brand: ACL
Price: 245.30 USD
Availability: InStock

$245.30

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ACL High Performance Main Bearing Set for Nissan L20/L24/L28 engines. This 0.25mm undersize set is built for demanding use.

Key Features

Fits 1970-1984 Nissan 240Z, 260Z, 280Z, 280ZX, 810, and Maxima.
Designed for high-performance L20, L24, and L28 engines.
0.25mm undersize main bearing set, suitable for ground crankshafts.
Multi-layer bearing material with a strong overlay for durability.
Helps maintain consistent oil clearance under demanding conditions.

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Will this fit your vehicle?

Product Details

When you're rebuilding or refreshing a Nissan L-series engine, getting the main bearings right is crucial for long-term health. This set from ACL is built for high-performance applications, meaning it's designed to handle more stress than stock bearings. They're 0.25mm undersize, which is important if you've had your crankshaft ground down during a rebuild – these bearings will properly account for that smaller diameter.

ACL uses a multi-layer bearing material with a specific overlay that's known for its strength and ability to withstand high loads and temperatures. This construction helps prevent bearing fatigue and ensures consistent oil clearance, which is key for keeping your engine running smoothly and preventing premature wear. If you're building a performance engine or restoring a classic Nissan, these bearings offer a solid foundation for your build.

This set is specifically for the L20, L24, and L28 engines found in many classic Datsun and Nissan vehicles. Make sure to check your engine's specific displacement and verify that your crankshaft has been machined to accept a 0.25mm undersize bearing. Proper installation, including correct oil clearances and torque specifications, is essential for these bearings to perform as intended.