Carrillo SCR4881-4 Pro-A Beam Forged Connecting Rods Set Honda/Acura F20C 6.024" 3/8 WMC

Designed to deliver the ideal balance of light weight and strength, the Pro-A beam configuration is purpose-built for demanding high-performance and motorsport applications where reducing rotating mass is a priority.

Key Specifications:

• Rod Length: 6.024 inches (center-to-center)
• Wrist Pin: 23mm, bushed, full-floating design
• Rod Bolt: 3/8" WMC (non-stretch, high-strength fastener)
• Advertised Weight: 529g per rod
• Material: Proprietary Carrilloy chrome-nickel-moly-vanadium forged steel alloy (VAR ASTM spec)
• Beam Profile: Pro-A (A-Beam) — aerodynamic and lightweight design

Construction & Quality Control:

• Manufactured in the USA from oversized proprietary steel forgings to ensure proper grain flow and elimination of surface inclusions
• Each rod is magnafluxed at least twice during production for surface flaw detection
• Rockwell hardness tested to validate the heat treat procedure on every individual piece
• Final controlled shot peen operation to relieve tensile stress and maximize fatigue life
• All critical CNC machining operations use probing to validate dimensional integrity
• Each rod is laser-engraved with a job number for full traceability

Fastener Details:

• Includes Carrillo WMC rod bolts — a non-stretch, high-strength fastener ideal for high-performance street and track use
• WMC bolts are available in H-11 tool steel (220,000 UTS) or Multiphase™ (285,000 UTS) materials
• All Carrillo fasteners feature a patented thread design and are sample-tested destructively for ultimate tensile strength and fatigue

The Pro-A beam profile reduces rotating assembly mass, allowing the engine to rev more freely with less internal drag. This makes the SCR4881-4 the preferred choice for naturally aspirated F20C builds focused on high-revving performance.