Carrillo SCR4727-4 Pro-H 5/16 CARR Bolt Connecting Rods for Mini Cooper Tritec 1.6

Built to CP-Carrillo's exacting performance standards, these rods are engineered for high-horsepower builds and are rated safe to 400+ horsepower.

Each rod in this matched set is precision-machined from CP-Carrillo's proprietary Carrilloy (4330M) alloy steel — a chrome, nickel, moly, vanadium alloy that meets VAR (Vacuum Arc Re-Melt) ASTM standards. This material delivers an exceptional combination of tensile strength, fatigue resistance, and durability under extreme engine loads.

Key Features:

• Pro-H beam design forged from proprietary Carrilloy (4330M) steel
• Equipped with 5/16 CARR bolts (MP35N fasteners with 285ksi UTS) for high-RPM reliability
• Rated safe to 400+ horsepower
• 459 grams total weight per rod for excellent strength-to-weight ratio
• Each rod is magnafluxed twice during production for surface flaw detection
• Rockwell hardness tested to validate heat treat procedure
• Shot-peened to relieve tensile stresses and maximize fatigue life
• Laser-etched job number on each rod for full traceability
• Made in the USA

CP-Carrillo connecting rods are manufactured from oversized proprietary steel forgings to ensure proper grain flow and eliminate surface inclusions. Every set ships as a precision-matched, weight-balanced assembly — no additional balancing required. The CARR bolt fastener system is engineered for sustained high-RPM use, making the SCR4727-4 an ideal upgrade for turbocharged, supercharged, or high-compression Tritec 1.6 builds.