What is the difference between standard size and undersize bearings?

Standard size bearings are for engines that have not had their crankshaft journals machined or resized. Undersize bearings are used when the crankshaft journals have been ground down to remove imperfections or to achieve a specific clearance, requiring a bearing that is thinner to compensate.

Do these bearings come with installation instructions?

While these bearings are designed as direct replacements, it is always recommended to refer to the specific service manual for your vehicle's engine. This ensures proper installation procedures, torque specifications, and oil clearance measurements are followed.

What is the typical lifespan of performance rod bearings?

The lifespan of performance rod bearings can vary significantly based on driving style, maintenance, and the overall health of the engine. With proper installation, regular oil changes with high-quality oil, and moderate driving, they can last for many miles, but they are considered a wear item in high-performance applications.

Specifications

Brand: ACL
Part #: 4B1185H-STD
UPC: 9315726280379

ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IX Standard Size High Performance Rod Bearing

Name: ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IX Standard Size High Performance Rod Bearing
Brand: ACL
SKU: acl-acl-mitsubishi-4g63-4g64-7-bolt-2nd-gen-dsm-and-evo-i-ix-standard-size-high--t14-12920
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 Connecting Rod Bearing Set 4B1185H-STD for Mitsubishi 4G63/4G64 engines. Standard size, high performance.

Key Features

Fits Eagle Summit, Hyundai Santa Fe, Hyundai Sonata, Kia Optima, Mitsubishi Eclipse, Expo, Expo LRV, Galant, Lancer, and Montero Sport.
Designed for Mitsubishi 4G63, 4G63T, and 4G64 engines.
Standard size for engines that have not been bored or honed.
Features ACL's specialized overlay system for improved load and temperature resistance.
Suitable for 7-bolt 4G63 engines found in DSM and EVO I-IX models.
Includes bearings for engines with flange main and thrust washers from 1997 onward.

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

About this part

Product Details

When you're rebuilding or upgrading a Mitsubishi 4G63, 4G63T, or 4G64 engine, especially the 7-bolt 4G63 found in DSM and EVO I-IX models, the connecting rod bearings are critical. These ACL high-performance rod bearings are built to handle the demands of performance applications, offering a solid option for standard-size applications. They are designed to fit specific Mitsubishi engines from 1992 through 2006, including models like the Eclipse, Galant, and Lancer, as well as certain Hyundai and Kia vehicles with compatible engines.

ACL uses a specialized overlay system with a high-strength overlay and a tough, yet compliant, overlay. This design helps these bearings withstand higher loads and temperatures common in performance engines. The standard size ensures a direct fit for engines that haven't been bored out, making installation straightforward for a rebuild. If your engine uses flange main bearings and thrust washers from 1997 onward, these bearings are the correct choice.

For engines that have been bored or honed, you'll need to select the appropriate undersize bearing. Always refer to your engine's specific measurements and the manufacturer's recommendations to ensure you select the correct size for optimal performance and longevity.