Toyota 4AG 16v / 20v H-Beam Connecting Rods

The Toyota 4AG 16v / 20v H-Beam Connecting Rods are crafted from 4340 high tensile steel, ensuring high performance and exceptional durability. The bushings are constructed from aluminum-silicon/bronze material, featuring a radial groove that acts as an oil reservoir. These rods are designed with a ribbed pin end to minimize distortion under heavy inertial loads while reducing excess weight. They undergo shot peening to relieve material stress and are multi-stage heat treated to enhance rigidity. The precise tolerances achieved during production guarantee a perfect fit while optimizing oil clearances, with controlled bend and twist.

Each rod is equipped with ARP 2000 cap fasteners rated at 220,000 psi, with an optional upgrade to ARP L19 material rated at 260,000 psi. The complete kit includes ARP moly and comprehensive fitting instructions. Note: The big end diameter is 43.00 mm.

Additional Machining Processes

• Dowel sleeves for perfect fit and accurate re-assembling
• Lipped Cap Relief for improved big-end integrity at extreme applications
• Grooves in Thrust Face for weight reduction

Technical Features of ZRP Connecting Rods

• Two-piece forging for enhanced strength
• Aluminum-silicon/bronze bushing with radial groove
• Shot peening for improved fatigue life
• Magnaflux inspection to ensure consistency of the forged material
• Double ribbed caps for added support
• Multi-stage heat treatment for maximum strength, dimensional stability, and fatigue life
• CNC machining for superior tolerances, precise to 0.0002"
• Center-to-center maintained under 0.001" tolerance
• Finite Element Analysis (FEA) for computer-generated stress analysis of connecting rods
• Optimal balancing for weight-matched sets of ± 1 gram