Eagle 2034655900A6 Forged 4340 Crankshaft 3.465" (88 mm) for Mitsubishi 4G63

Vehicle Fitment

• Mitsubishi 4G63 engine - 6-bolt rear flange (typically 1989-1992 DSM / Eclipse / Talon)

Features

• Forged 4340 chromoly steel for high strength and durability
• Non-twist forging with shot-peening and multi-stage heat treatment
• Precision-ground journals with .125" fillet radii for added fatigue resistance
• Nitrided surface for improved wear resistance
• X-ray, magnaflux, and sonic-tested for structural integrity
• Micro-polished oil holes and journal surfaces for smooth operation
• Designed with internal balance for stable high-RPM use
• Target bobweight tolerance of ±2% for efficient balancing

Specifications

• Part Number: 2034655900A6
• Stroke: 3.465" (~88 mm)
• Material: Forged 4340 steel
• Balance: Internal
• Main Journal Diameter: ~2.244"
• Rod Journal Diameter: ~1.771"
• Minimum Rod Length: ~5.900"
• Bolt Pattern / Flywheel: 6-bolt rear flange
• Typical Weight: ~33 lb

Included Components

• 1x Eagle forged 4G63 crankshaft (2034655900A6)

Product Description

The Eagle 2034655900A6 is a high-performance crankshaft built for the Mitsubishi 4G63 engine. Made from forged 4340 steel and treated through multiple manufacturing steps, this crank is engineered to handle high-stress conditions, making it ideal for racing, turbo builds, or any performance application demanding reliability.

With its 3.465" stroke (88 mm), this crank maintains the stock stroke of the 4G63 while delivering all the benefits of a stronger, forged component. The internal balance design provides smoother high-RPM behavior, and the tight manufacturing tolerances ensure consistent performance. The .125" fillet radius on journals boosts strength but requires chamfered or narrow bearings.

Because it's a rotating assembly part, proper balancing is essential: you should balance this crank to your rods and pistons to get the best performance and longevity. Once installed, this crank gives you a robust foundation for building a high-output or high-revving 4G63 engine.