What is the advantage of the 6mm longer connecting rod design?

The 6mm longer design is often used in performance engine builds to alter the rod-to-stroke ratio. This can affect piston speed and dwell time at top dead center, potentially improving cylinder filling and power delivery in specific engine configurations.

Are these rods suitable for a naturally aspirated engine build?

While these rods are built for high-performance and are often used in turbocharged or supercharged applications, their robust construction from forged 4340 steel makes them a strong option for a naturally aspirated build as well, offering significant durability improvements over stock components.

What is the significance of the 625+ bolts included with these rods?

The 625+ bolts are a higher-strength fastener compared to standard rod bolts. They are designed to withstand the increased clamping forces and stresses found in high-performance engines, ensuring the connecting rod stays securely attached to the crankshaft under extreme operating conditions.

Specifications

Brand: Manley Performance
Part #: 14421R6-4
UPC: 807298004389

Manley 03-06 Evo 8/9 (4G63T) T/T Pro Series I Beam Connecting Rod Set (6mm longer) w/ 625+ Bolt

Name: Manley 03-06 Evo 8/9 (4G63T) T/T Pro Series I Beam Connecting Rod Set (6mm longer) w/ 625+ Bolt
Brand: Manley Performance
SKU: manley-performance-manley-03-06-evo-8-9-4g63t-t-t-pro-series-i-beam-connecting-r-t14-250120
Price: 1319.86 USD
Availability: InStock

$1319.86

In Stock

Fits 1993-1999 Mitsubishi Eclipse. Manley Pro Series I-Beam connecting rods are built for high-performance 4G63T engines.

Key Features

Fits 1993-1999 Mitsubishi Eclipse, 2003-2006 Mitsubishi Lancer, 1993-1998 Eagle Talon, and 1993-1994 Plymouth Laser.
Features a 6mm longer design compared to stock, suitable for specific engine builds.
Constructed from forged 4340 vacuum degassed steel alloy for high strength and durability.
Includes 625+ bolts, offering a stronger clamping force for demanding applications.
I-beam design provides a strong and efficient profile for performance engines.
NHRA Legal certification on select SKUs, indicating compliance for racing categories.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

Starting with the 6mm longer design and the inclusion of 625+ bolts, these Manley Pro Series I-Beam connecting rods are a serious upgrade for your 1993-1999 Mitsubishi Eclipse, 2003-2006 Lancer, or 1993-1998 Eagle Talon/1993-1994 Plymouth Laser equipped with the 4G63T engine. These aren't just standard replacement parts; they're built to handle significantly more stress than factory components, making them a popular choice for builds pushing the limits of the 4G63T platform.

Manley uses a forged 4340 vacuum degassed steel alloy for these rods, a material known for its exceptional strength and durability under high loads and RPMs. The I-beam design is a well-established choice for performance applications because it offers a strong yet relatively lightweight profile. The included 625+ bolts are a critical component, providing a more robust clamping force than standard rod bolts, which is essential for maintaining bearing integrity when the engine is under extreme pressure. This set is also designed to be NHRA legal for certain racing categories, indicating their pedigree in high-performance environments.

When you're rebuilding the top end of a 4G63T engine, especially for boosted applications, the connecting rods are one of the first components to consider upgrading. These Manley rods are a well-made option that offers a significant improvement over stock, giving you the confidence to tune your engine for more power. They are a direct fit for the specified vehicles, but as with any internal engine work, professional installation is recommended to ensure proper assembly and alignment.