Carrillo SCR4245-1 Pro-H Connecting Rod Subaru EJ Series 3/8 WMC Bolt Single

The Carrillo SCR4245-1 is a single Pro-H forged connecting rod designed for Subaru EJ-series engines, including the EJ18, EJ20, and EJ257 found in the WRX and STI platforms. This rod is sold individually, making it ideal for replacement or custom odd-count builds.

Key Features:

• Forged from CP-Carrillo's proprietary Carrilloy steel — a chrome, nickel, moly, vanadium alloy meeting all VAR (Vacuum Arc Re-melt) ASTM standards
• Pro-H beam design engineered for superior strength-to-weight balance in high-horsepower and high-RPM applications
• Equipped with a 3/8 WMC (Wedge Micro Collar) bolt for reliable clamping force under extreme stress
• Fully CNC-machined from oversized proprietary steel forgings to ensure proper grain flow and removal of surface inclusions
• 100% magnaflux inspected (minimum twice per rod) and Rockwell hardness tested after heat treatment
• Final shot peen operation replaces tensile stresses with beneficial compressive stresses, extending fatigue life
• Each rod is laser-etched with a job number for full production traceability
• Manufactured in Irvine, California, USA

CP-Carrillo connecting rods are trusted by professional racing programs across drag racing, oval track, road racing, and rally — delivering the dimensional integrity and fatigue resistance demanded by the most extreme engine builds.