Carrillo SC7120X-4 Forged Steel Connecting Rods

Built using CP-Carrillo's proprietary Carrilloy 4330M chromoly steel alloy — a chrome, nickel, moly, vanadium blend manufactured to vacuum arc re-melt (VAR) ASTM standards — these rods deliver an exceptional combination of tensile strength, fatigue resistance, and consistent dimensional integrity.

Key Features:

• Manufactured from oversized proprietary steel forgings to ensure proper grain flow and eliminate surface inclusions
• Each rod is magnaflux inspected twice and Rockwell hardness tested to validate heat treatment
• Finished with a controlled shot peen operation to relieve tensile stress and maximize fatigue life
• Precisely CNC-machined with probing validation to guarantee dimensional accuracy
• Each rod is laser-etched with a job number for full traceability
• Each set includes a detailed spec sheet with proper torque and stretch values for rod bolt installation
• Proudly made in the USA

CP-Carrillo connecting rods are available with two bolt options: the standard WMC-H7 (H11 Tool Steel) bolt rated at 220,000 PSI ultimate tensile strength, or the upgraded CARR-S7 (MP35N) bolt rated at 285,000 PSI UTS — both featuring asymmetrical threads for optimized clamp load and enhanced fastener fatigue life. The "X" designation in the part number typically denotes the CARR bolt configuration.

CP-Carrillo's connecting rods have earned a benchmark reputation across virtually every form of motorsports, from drag racing and oval track to road racing and off-road competition. These rods are engineered to replace OEM connecting rods with a significant upgrade in strength, durability, and performance. Professional installation by an experienced engine builder is recommended.