I-Beam “Heavy Duty” Series Connecting Rods for Nissan Skyline RB25 / RB26

Designed for high horsepower and boost applications, these connecting rods are crafted from 4340 high tensile steel, ensuring extreme durability and performance. The bushings are made from AMPCO 18 material, providing excellent resistance to wear and fatigue, and feature a radial groove for oil reservoir functionality. Shot peened to relieve stress and multi-stage heat treated for increased rigidity, these rods maintain tight tolerances for perfect fitment and optimized oil clearances. Each rod includes 3/8 ARP 2000 cap fasteners rated at 220,000 psi, with an optional upgrade to ARP L19 material rated at 260,000 psi.

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

• I-Beam Shape for extra rigidity
• Two-Piece forging for great strength
• Shot Peening for improved fatigue life
• Magnaflux Inspection ensures material consistency
• Double ribbed caps for added support
• Multi Stage Heat Treatment for maximum strength and dimensional stability
• CNC machining for superior tolerances, precise to 0.0002"
• Center to center maintained under .001" tolerance
• Finite Element Analysis (FEA) for stress analysis
• Optimal balancing for weight matched sets of ± 1 gram