What does 0.25mm undersize mean for my engine?

This means the bearing is slightly smaller than the standard size. It's intended for use when the crankshaft journal has been machined down by 0.25mm (or 0.010 inches) during a rebuild. This ensures the correct oil clearance between the bearing and the crankshaft.

Are these bearings suitable for a stock engine rebuild?

These are high-performance bearings, often used in modified or performance-built engines. While they can be used in a stock rebuild, ensure your crankshaft has been machined to the 0.25mm undersize specification. For a standard stock rebuild without machining, you would typically need standard size bearings.

What is the material of these rod bearings?

These ACL performance rod bearings are constructed from a tri-metal material. This type of material is known for its strength, durability, and ability to withstand high loads and temperatures, making it suitable for performance applications.

ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IX 0.25mm Oversized High Performance Rod Beari

Specifications

Brand: ACL
Part #: 4B1185H-.25
UPC: 9315726280416

ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IX 0.25mm Oversized High Performance Rod Beari

Name: ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IX 0.25mm Oversized High Performance Rod Beari
Brand: ACL
SKU: acl-acl-mitsubishi-4g63-4g64-7-bolt-2nd-gen-dsm-and-evo-i-ix-0-25mm-oversized-hi-t14-12955
Price: 46.77 USD
Availability: BackOrder

$46.77

On Backorder — Expected to ship by May 9, 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 0.25mm Oversized High Performance Rod Bearing Set.

Key Features

Fits 1992-2006 Mitsubishi Eclipse, Lancer, and other applications.
Designed for 7-bolt Mitsubishi 4G63 and 4G64 engines.
0.25mm (0.010 inch) undersize for reground crankshafts.
High-performance tri-metal material for strength and wear resistance.
Helps maintain proper oil clearance and pressure in modified engines.
ACL is a well-known manufacturer of engine bearings.

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

Already running a built 4G63 or 4G64 engine? These ACL high-performance rod bearings are the next piece of the puzzle for ensuring reliable power. Designed for Mitsubishi 7-bolt 4G63 and 4G64 engines, these bearings are precision-sized at 0.25mm (0.010 inches) undersize, making them ideal for crankshafts that have been reground to that specific dimension. ACL has been a trusted name in engine bearings for a long time, and their performance line is built to handle the stresses of modified engines.

These bearings are made with a tri-metal material that offers excellent strength and wear resistance, crucial for maintaining oil pressure and preventing premature wear under demanding conditions. The 0.25mm undersize is a common size for crankshafts that have been reconditioned, ensuring a proper fit and optimal oil clearance. They are designed to fit specific 7-bolt 4G63 and 4G64 applications, including popular DSM and EVO models, as well as certain Hyundai and Kia vehicles with the same engine family.

When rebuilding or modifying your engine, using the correct size bearings is critical for longevity and performance. These ACL bearings are a solid option for anyone looking to ensure the health of their bottom end after a rebuild or modification. Always refer to your engine's specific service manual for proper installation procedures and torque specifications.