Carrillo SCR4731-4 Pro-SR Connecting Rods

Built in the USA, these rods are machined from Carrillo's proprietary Carrilloy alloy steel — a chrome, nickel, moly, vanadium alloy that meets all VAR (vacuum arc re-melt) ASTM standards — delivering exceptional strength, fatigue resistance, and reliability under extreme engine loads.

Key Features:

• Forged from proprietary Carrilloy (4330M) alloy steel for superior strength and durability
• Pro-SR beam design optimized for strength-to-weight balance in high-performance applications
• Full-floating wrist pin bushing design for reduced friction and increased longevity
• Each rod is magnafluxed a minimum of twice during production for surface flaw detection
• Rockwell hardness tested on every rod to validate the heat treat process
• Shot-peened finish to relieve tensile stresses and extend fatigue life
• CNC-machined with dimensional probing for validated precision and consistency
• Laser-engraved job number on each rod for full traceability
• Made in the USA

Carrillo connecting rods are trusted by professional engine builders and racers worldwide across drag racing, road racing, oval track, and powersports disciplines. The SCR4731-4 set delivers the same race-proven quality and strict quality control standards that have made Carrillo the benchmark in high-performance connecting rod manufacturing.