Carrillo SCR4730-4 Pro-A Beam Forged Connecting Rods Set with 3/8" WMC Bolts

The Pro-A beam design delivers an exceptional strength-to-weight ratio through its lightweight, aerodynamic construction that reduces reciprocating mass — directly contributing to faster engine response and higher sustainable RPM.

These rods are manufactured from CP-Carrillo's proprietary Carrilloy alloy — a chrome, nickel, moly, vanadium steel that meets all VAR (Vacuum Arc Re-Melt) ASTM standards. The material is validated by both the supplier and an independent metallurgist to confirm its chemical and physical properties. All heat treatment processes use a mar-aged operation, resulting in a UTS of 195,000 psi with a yield of 182,000 psi, while maintaining low notch-sensitivity and ductility critical for high-cycle fatigue resistance.

Each rod is produced from an oversized forging to ensure proper grain flow and eliminate surface inclusions generated during the forging process. During production, every rod is magnafluxed twice and Rockwell hardness tested to validate heat treat integrity. A final controlled shot peen operation relieves tensile stresses and imparts beneficial compressive stresses to improve fatigue life. Each completed rod is laser-engraved with a job number for full traceability.

Key Features:

• Pro-A Beam design — lightweight, aerodynamic construction ideal for naturally aspirated high-RPM applications
• Carrilloy proprietary alloy — chrome/nickel/moly/vanadium steel meeting VAR ASTM standards
• UTS of 195,000 psi / Yield of 182,000 psi — mar-aged heat treatment for maximum tensile strength
• 3/8" WMC cap bolts included — manufactured with asymmetrical threads for evenly distributed thread engagement and improved clamp load
• Rated for up to 800 whp — suitable for street/strip and all-motor builds
• Manufactured from oversized forgings for proper grain flow and inclusion-free surfaces
• Double magnaflux inspected and Rockwell tested during production
• Shot peened for improved surface compressive stress and fatigue life
• Laser-engraved job number for material traceability
• Made in the USA

The Carrillo SCR4730-4 connecting rod set is the premier choice for builders seeking proven performance and uncompromising quality in a high-revving naturally aspirated application.