What does '0.025mm oversized' mean for these bearings?

This means the bearings are slightly larger in diameter than standard. They are intended for use when the crankshaft journals have been machined down by 0.025mm to ensure a proper fit and oil clearance.

Are these bearings suitable for a stock engine?

These are high-performance bearings designed for modified or performance-built RB25 and RB30 engines. They are specifically sized for a crankshaft that has been machined to 0.025mm undersize.

What is the benefit of using ACL bearings?

ACL is known for producing well-built engine components. These bearings are constructed with specific materials and designs to withstand the demands of higher performance applications and maintain proper oil clearance.

ACL Nissan RB25/RB30 0.025mm Oversized High Performance Main Bearing Set

Specifications

Brand: ACL
Part #: 7M2394H-.025
UPC: 9315726316535

ACL Nissan RB25/RB30 0.025mm Oversized High Performance Main Bearing Set

Name: ACL Nissan RB25/RB30 0.025mm Oversized High Performance Main Bearing Set
Brand: ACL
SKU: acl-acl-nissan-rb25-rb30-0-025mm-oversized-high-performance-main-bearing-set-t14-17640
Price: 123.51 USD
Availability: BackOrder

$123.51

On Backorder — Expected to ship by Apr 23, 2026

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

Fits 2009 Nissan GT-R. ACL 0.025mm oversized main bearings for RB25/RB30 engines. Built for high performance.

Key Features

Fits 2009 Nissan GT-R.
ACL main bearing set for RB25 and RB30 engines.
0.025mm oversized for use with machined crankshaft journals.
High performance design handles increased stress and RPMs.
Well-built by ACL for reliable engine operation.

Secure CheckoutFast Shipping631-982-0042

Fits this vehicle

Nissan GT-R 2009

Product Details

When you're building a performance RB25 or RB30 engine for your 2009 Nissan GT-R, the right bearings are crucial. This set from ACL is 0.025mm oversized, meaning they're designed to be used when the crankshaft journals have been machined down by 0.025mm to clean them up or correct wear. These aren't your average bearings; they're built with high performance in mind, offering a solid foundation for increased power and RPMs.

ACL has a reputation for making well-built engine components, and these main bearings are no exception. They use specific material compositions and construction techniques to handle the extra stress and heat that come with a performance build. Using bearings that are the correct size for your machined crankshaft is essential for proper oil clearance, which directly impacts oil pressure and the longevity of your engine's rotating assembly.

If you've already had your crankshaft journals measured and machined to 0.025mm undersize, this set is the perfect match. Make sure you've got the right tools and a clean workspace for installation, as bearing installation is a critical step in any engine rebuild.