ARP 300-6628 Connecting Rod Bolt Kit for Carrillo Rods ARP3.5 Super Alloy

The ARP 300-6628 is a premium connecting rod bolt kit designed as a direct replacement for Carrillo connecting rods. This 2-piece kit features ARP's advanced ARP3.5 super alloy material, delivering exceptional strength and reliability for high-performance racing applications where extreme loads, high RPM, and extended service life are critical requirements.

ARP3.5 Super Alloy Technology

ARP3.5 (AMS5844) represents the pinnacle of fastener materials, featuring a high-cobalt super alloy composition similar to those used in jet engine and aerospace applications. This exotic material delivers tensile strength in the 260,000-280,000 psi range with superior fatigue characteristics that far exceed conventional steel alloys. The material is completely immune to hydrogen embrittlement and corrosion, eliminating common failure modes associated with traditional rod bolts.

Premium Manufacturing Process

• Forged in-house at ARP using the finest quality super alloy materials
• Heat-treated using special vertical racks to ensure complete 360-degree penetration
• Threads rolled after heat-treat to provide up to 10 times longer fatigue strength
• Precision CNC-machined to exacting specifications for perfect fitment
• Each bolt proudly stamped with the ARP name as assurance of quality

Wave-Loc Technology

Many ARP connecting rod bolts feature the patented Wave-Loc design, which provides superior alignment and interference fit compared to traditional knurled surfaces. The Wave-Loc surface contacts the rod and cap for optimum alignment while reducing fluctuating stress, actually strengthening the rod itself. This design provides a secure interference fit of .001 to .005 inches while maintaining superior material grain flow and eliminating galling or scoring of the connecting rod bore.

Application

This kit is specifically engineered as a replacement for Carrillo aftermarket connecting rods. The ARP3.5 super alloy material makes it ideal for Formula 1, NASCAR, IRL, and other professional racing applications where maximum strength, extreme RPM capability, and extended service life justify the premium material investment. The corrosion resistance and fatigue properties of ARP3.5 provide an extra margin of safety in the most demanding racing environments.

Important Maintenance Note

To ensure maximum service life and safety, it is critically important to monitor the stretch of each bolt and replace it when it has permanently elongated by .0005 inches. Regular inspection and measurement are essential maintenance practices for high-performance connecting rod assemblies.