Carrillo SCR5449-6 Nissan VQ37HR Pro-H 3/8 CARR Bolt Connecting Rods

Designed for high-horsepower and high-RPM applications, these rods are built to withstand the demands of forced induction, naturally aspirated performance builds, and motorsport use.

Each rod is machined from CP-Carrillo's proprietary Carrilloy steel — a chrome, nickel, moly, vanadium alloy that meets all VAR (Vacuum Arc Re-Melt) ASTM standards. This oversized forging process ensures proper grain flow throughout the material and guarantees removal of any surface inclusions that could compromise strength or reliability.

Key Features:

• Pro-H beam design — optimized geometry for maximum strength-to-weight ratio
• 3/8 CARR bolt fasteners — CP-Carrillo's proprietary high-strength rod bolts for reliable clamping under extreme loads
• Manufactured from proprietary Carrilloy alloy steel (chrome, nickel, moly, vanadium) meeting VAR ASTM standards
• Each rod is magnafluxed twice during production to identify any surface flaws
• Rockwell hardness tested on every rod to validate the heat treat procedure
• Shot peened finish to relieve tensile stress and increase fatigue life
• CNC-machined with probing for dimensional validation and precise fitment
• Laser-etched job number on each rod for full traceability
• Made in the USA at CP-Carrillo's facility in Irvine, California

CP-Carrillo has been manufacturing performance connecting rods since 1963, making them one of the most trusted names in high-performance engine internals for both street and race applications. Every set ships with detailed rod specifications and proper torque/stretch values for the rod bolts.