ARP 300-6622 Connecting Rod Bolt Kit - 3/8" ARP3.5 Carrillo Replacement (2 Pieces)

The ARP 300-6622 is a high-performance connecting rod bolt kit designed as a Carrillo replacement, featuring 2 precision-engineered bolts in 3/8" diameter. These bolts are manufactured from ARP3.5 (MP35N) super alloy material, representing one of the most advanced fastener materials available for extreme racing applications.

Premium ARP3.5 Super Alloy Construction

ARP3.5 is a high-cobalt nickel-based super alloy primarily used in aerospace and jet engine applications where extreme heat and stress attack critical components. This exotic material delivers tensile strength in the 260,000-280,000 psi range with superior fatigue characteristics compared to standard chrome moly or even ARP2000 materials. The alloy is completely immune to hydrogen embrittlement and corrosion, making it ideal for high-RPM endurance racing in Formula 1, NASCAR, IRL, and drag racing applications.

Precision Manufacturing Process

Each bolt is forged in-house at ARP using strict quality control standards. The fasteners are heat-treated using special vertical racks to ensure complete 360-degree heat penetration for consistent material properties. Threads are rolled after heat treatment, providing up to 10 times longer fatigue strength compared to cut threads. Every bolt is precision CNC-machined to exacting specifications and features the ARP name stamped on each piece as assurance of quality.

Carrillo Rod Compatibility

This kit is specifically designed as a direct replacement for Carrillo connecting rods. The weak link in a connecting rod has always been the bolt, and racers know that nobody builds a better bolt than ARP. When upgrading to exotic super alloy materials like ARP3.5, you gain improved reliability, extended service life, and maximum safety margins for extreme loads and high rotational speeds.

Important Installation Notes

It is critically important to monitor the stretch of each bolt and replace it when it has permanently elongated by .0005". Always verify with your engine builder that you are ordering the correct ARP rod bolts for your specific application. Use ARP Ultra-Torque assembly lubricant and follow manufacturer torque specifications for proper installation.

Kit Contents: 2 connecting rod bolts, 3/8" diameter, ARP3.5 material