Eagle CRS5900MA3D 4340 H-Beam Rods Mitsubishi 4G63 6-Bolt 1989-1992 Set of 4

Vehicle Fitment

• 1989-1992 Mitsubishi Eclipse GST / GSX (4G63T Turbocharged, 6-Bolt Crankshaft)
• 1989-1992 Eagle Talon TSi (4G63T Turbocharged, 6-Bolt Crankshaft)
• 1989-1992 Plymouth Laser RS (4G63T Turbocharged, 6-Bolt Crankshaft)
• 1991-1992 Mitsubishi Galant VR4 (4G63T Turbocharged, 6-Bolt Crankshaft)

Fitment Notes

• Fits the 1st generation 6-bolt 4G63 engine ONLY - this rod set uses the early-style 1.117" big end width and 0.827" (21mm) wrist pin specific to the 6-bolt crankshaft 4G63; it is NOT compatible with the 7-bolt 4G63 found in 1993 and later DSM vehicles, which uses a different big end width (1.038") and pin size (0.866"); see Eagle CRS5900MB3D for the 7-bolt application
• Bushed for a full-floating 0.827" (21mm) piston pin - confirm your pistons use the 21mm pin size; 7-bolt/2nd gen pistons using the 0.866" (22mm) pin are not compatible
• Rod bolt torque specification: 43 ft-lbs using ARP Moly Lube ONLY - do not substitute any other lubricant on ARP 2000 rod bolts
• Sold as a weight-matched set of 4 rods - all 4 rods are matched to within ±1g for balanced rotating assembly dynamics
• HP rating with included 3/8" ARP 2000 bolts: 900 HP - for extreme applications exceeding this threshold, see Eagle CRS5900MAXD (Extreme Duty, ARP Custom Age 625+)
• Not for use in pollution-controlled vehicles; recommended for competition use

Features

• Forged 4340 steel - certified SAE 4340 chromium-molybdenum-nickel alloy steel, vacuum-degassed for reduced internal porosity and consistent material properties; Eagle sources 4340 with a tighter alloy content specification than the AISI/SAE minimum, using a proprietary material mix that improves fatigue strength and resistance to high-cycle loading in the turbocharged 4G63 environment
• H-Beam cross-section - provides an optimal strength-to-weight ratio for the 4G63 application, with 575g typical weight per rod offering meaningfully less rotating mass than the factory connecting rods while delivering significantly superior fatigue life under sustained boost and high-RPM competition use
• Two-piece forging process - rod body and cap are forged separately, allowing grain orientation in each piece to be optimized for its specific load direction; the cap is forged with grain perpendicular to load forces for maximum cap strength; precision cap alignment sleeves positively index the cap during assembly for accurate housing bore geometry and consistent clamping force
• Multi-stage heat treatment - stress relief and tempering after forging for uniform internal material properties and improved fatigue life throughout the rod
• X-rayed, sonic-tested, and magnafluxed - full non-destructive inspection of every Eagle ESP H-Beam rod to verify structural integrity and detect any subsurface defects before shipping
• 100% machined and shot-peened - all critical surfaces are fully machined to Eagle's dimensional tolerances, then shot-peened to relieve surface tensile stress and improve fatigue resistance
• 3/8" ARP 2000 rod bolts - rated at 230,000 psi tensile strength, providing an 1200 HP capable fastener significantly stronger than standard ARP 8740 bolts, appropriate for the high cylinder pressures generated by high-boost 4G63T builds
• Silicon bronze small-end bushing for full-floating wrist pin retention and smooth 21mm pin rotation
• Typical weight: 575g per rod; weight-matched to ±1g within the set

Specifications

• Part Number: CRS5900MA3D
• Material: Forged 4340 Steel (Vacuum-Degassed, Certified)
• Design: H-Beam, Two-Piece Forging
• Application: Mitsubishi 4G63 - 6-Bolt Crankshaft (1st Generation, 1989-1992)
• Quantity: Set of 4
• Center-to-Center Length: 5.900"
• Rod Journal Diameter: 1.771"
• Housing Bore: 1.890"
• Pin Size: 0.827" (21mm)
• Big End Width: 1.117"
• Pin End Width: 1.117"
• Typical Weight: 575g per rod
• Weight Matching: ±1g per set
• Piston Pin Retention: Full-Floating (Bushed)
• Rod Bolt: 3/8" ARP 2000 (230,000 psi)
• Rod Bolt Torque: 43 ft-lbs (ARP Moly Lube Only)
• HP Rating: 900 HP (with included ARP 2000 bolts)

Included Components

• 4x Eagle H-Beam Connecting Rods (CRS5900MA3D) - weight-matched set, includes pre-installed 3/8" ARP 2000 rod bolts
• Note: Pistons, wrist pins, snap rings, and bearings are NOT included.

Product Description

The Eagle CRS5900MA3D is a weight-matched set of four forged 4340 steel H-beam connecting rods engineered for the Mitsubishi 4G63 engine with the 6-bolt crankshaft - the 1st generation configuration found in 1989-1992 Mitsubishi Eclipse GST/GSX, Eagle Talon TSi, Plymouth Laser RS, and Mitsubishi Galant VR4. The 6-bolt and 7-bolt 4G63 engines use different rod geometry, and these rods are not interchangeable with the later 7-bolt crankshaft 4G63 found in 1993 and later DSM vehicles. The key dimensional differences are the big end width (1.117" for 6-bolt vs. 1.038" for 7-bolt) and wrist pin diameter (0.827" / 21mm for 6-bolt vs. 0.866" / 22mm for 7-bolt). Builders using 7-bolt 4G63 engines should refer to Eagle CRS5900MB3D.

Each rod is forged from Eagle's certified vacuum-degassed 4340 chromium-molybdenum-nickel alloy steel through a two-piece forging process that separately forges the rod body and cap for optimized grain orientation in each section. After forging, every rod undergoes multi-stage heat treatment, X-ray, sonic testing, magnaflux inspection, 100% machining, and shot peening. The H-Beam geometry delivers 575g typical weight per rod - meaningfully less rotating mass than the factory 4G63 rods - while providing the structural stiffness and fatigue life required for the sustained high cylinder pressures of aggressive turbocharged 4G63T builds.

The set ships with 3/8" ARP 2000 rod bolts rated at 230,000 psi tensile strength, supporting engine builds up to 900 HP. All rod bolts must be torqued to 43 ft-lbs using ARP Moly Lube only - no substitute lubricant should be used. The small end is bushed for a full-floating 0.827" (21mm) wrist pin. All four rods in the set are weight-matched to within ±1g. Not for use in pollution-controlled vehicles.