Carrillo SCR4227-4 Pro-H Connecting Rods Alfa Romeo 1750/2000cc 3/8 CARR Bolt

Featuring Carrillo's premium 3/8 CARR bolt fastener system and a 6.180-inch (157mm) rod length with a 22mm full-floating wrist pin bushing, these rods are purpose-built to withstand the extreme demands of high-performance and competition applications.

Key Features:

• Pro-H Straight H-Beam Design — the stoutest connecting rod configuration available from Carrillo, optimized for maximum strength under high-RPM and high-load conditions
• Proprietary Carrilloy Steel Forging — manufactured from oversized USA-made proprietary 4330M chrome-nickel-moly-vanadium alloy forgings to ensure proper grain flow and eliminate surface inclusions
• 3/8 CARR Bolt Fasteners — custom-designed MP35N high-strength fasteners with asymmetrical threads for superior clamp load and extended fatigue life; recommended for high-RPM builds
• 22mm Full-Floating Wrist Pin — bushed small end accepts a full-floating wrist pin for reduced friction and improved durability
• 617g Advertised Weight Per Rod — precision weight-matched set for improved engine balance
• Multi-Step Quality Inspection — each rod is magnafluxed twice and Rockwell hardness tested to validate heat treatment; shot-peened for enhanced compressive stress and fatigue life
• Laser-Etched Traceability — each rod receives a unique job number for 100% production traceability
• Includes CP-Carrillo moly-based fastener lubrication

Made in the USA. Each set ships with a detailed spec sheet including individual rod measurements and the proper bolt torque/stretch specifications.