What does 0.025mm undersize mean for these rod bearings?

This means the inside diameter of the bearings is 0.025mm smaller than a standard size bearing. They are intended to be used with a crankshaft that has been machined down by 0.025mm to ensure proper oil clearance.

Are these bearings suitable for a stock engine rebuild?

These are high-performance bearings, often used in performance builds or when a crankshaft has been machined. For a stock rebuild without any crankshaft machining, you would typically need standard size bearings.

What is the typical application for these bearings?

These bearings are commonly used in performance-oriented builds of Mitsubishi 4G63 and 4G64 engines, such as those found in DSM and EVO models, where increased power and RPMs are expected.

ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IX 0.025mm Oversized High Performance Rod Bear

Specifications

Brand: ACL
Part #: 4B1185H-.025
UPC: 9315726280393

ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IX 0.025mm Oversized High Performance Rod Bear

Name: ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IX 0.025mm Oversized High Performance Rod Bear
Brand: ACL
SKU: acl-acl-mitsubishi-4g63-4g64-7-bolt-2nd-gen-dsm-and-evo-i-ix-0-025mm-oversized-h-t14-12954
Price: 46.77 USD
Availability: BackOrder

$46.77

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.

ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IX 0.025mm Oversized High Performance Rod Bearing Set.

Key Features

Fits 1992-2006 Mitsubishi Eclipse, Lancer, Galant, Expo, Expo LRV, Montero Sport, and more.
Also fits 1993-1996 Eagle Summit, 1999-2005 Hyundai Sonata, 2001-2004 Hyundai Santa Fe, and 2001-2006 Kia Optima.
Set includes rod bearings for 7-bolt 4G63, 4G63T, and 4G64 engines.
Bearings are 0.025mm (0.001 inch) undersize for use with a machined crankshaft.
High-performance design from ACL, a well-known engine bearing manufacturer.

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Will this fit your vehicle?

Product Details

Already running a built 4G63 or 4G64 engine? This set of ACL high-performance rod bearings is the next piece of the puzzle for ensuring reliable power. These bearings are specifically sized at 0.025mm undersize, which is crucial when you've already had your crankshaft ground down to match. ACL has been making engine bearings for a long time, and they're known for well-built parts that hold up under pressure.

This set is designed for Mitsubishi 4G63 and 4G64 engines, covering a range of DSM and EVO models, as well as some Hyundai and Kia applications. The 0.025mm undersize means they're meant to be paired with a crankshaft that has been machined down by that amount. Using the correct bearing size is critical for maintaining proper oil clearance, which is essential for lubrication and preventing premature wear, especially in performance applications.

When you're building or rebuilding an engine, especially one that will see higher RPMs or increased load, using quality bearings like these from ACL is a smart move. They help ensure that the critical rotating assembly stays properly lubricated and supported.