Carrillo MX4P25 High-Performance Connecting Rod WMC Bolt

The Carrillo MX4P25 is a precision-engineered, high-performance connecting rod built to the exacting standards CP-Carrillo has maintained since 1963. Manufactured in Irvine, California, this rod is crafted from Carrilloy — CP-Carrillo's proprietary 4330m chromoly steel alloy featuring a chrome, nickel, moly, and vanadium composition that meets all VAR (Vacuum Arc Re-Melt) ASTM standards — delivering tensile strength and fatigue resistance far beyond OEM components.

Key Features:

• Machined from oversized proprietary Carrilloy 4330m chromoly steel forgings for proper grain flow and elimination of surface inclusions
• Fully machined profile guarantees removal of all surface imperfections from the forging
• 100% magnaflux inspected and hardness-checked after heat treatment, then finish-machined to final size
• Shot-peened after balancing to maximize fatigue strength and service life
• Equipped with WMC (H11 Tool Steel) rod bolt featuring a 220,000 PSI ultimate tensile strength rating
• Balancing pads included for precision weight matching across a set
• Designed and manufactured using advanced 3-D modeling software and CNC machining for consistent, tight tolerances
• Every rod set ships with a detailed specification printout and proper torque/stretch values for the rod bolts

CP-Carrillo connecting rods are trusted by professional engine builders and racers across motorsports and powersports disciplines worldwide. The MX4P25 is built to exceed OEM specifications, making it a race-proven choice for performance builds that demand reliability at high RPM and under sustained stress.