ARP 300-6722 Custom Age 625+ Connecting Rod Bolts for Carrillo Rods

The ARP 300-6722 is a premium connecting rod bolt kit specifically designed as a replacement for Carrillo connecting rods. This 2-piece kit features ARP's advanced Custom Age 625+ material, a super-alloy that delivers superior fatigue cycle life, tensile strength in the 260,000-280,000 psi range, and complete resistance to atmospheric corrosion and oxidation.

Why ARP Rod Bolts Are Superior:

The connecting rod bolt has historically been the weak link in any connecting rod assembly. ARP has earned its reputation by producing rod bolts with up to ten times the fatigue strength of competitor fasteners. This exceptional durability comes from ARP's proprietary manufacturing process, which includes in-house forging, specialized heat treatment, and post-heat-treat thread rolling.

Custom Age 625+ Material Benefits:

• Tensile strength of 260,000-280,000 psi for extreme load handling
• Superior fatigue cycle life for extended service intervals
• Complete immunity to hydrogen embrittlement and stress corrosion
• No moisture sensitivity—superior corrosion resistance compared to traditional alloys
• Cost-effective alternative to MP-35 with comparable performance

ARP Manufacturing Excellence:

• Forged in-house using premium quality materials
• Heat-treated on special vertical racks for complete 360-degree penetration
• Threads rolled after heat-treat for up to 10 times longer fatigue life
• Precision CNC-machined to exacting tolerances
• Each bolt proudly stamped with the ARP name as assurance of quality

Important Installation Note:

Monitor bolt stretch regularly and replace any bolt that has permanently elongated by 0.0005 inches or more to maintain optimal rod integrity and engine reliability.

Carrillo and numerous other premium connecting rod manufacturers choose ARP bolts as original equipment because racers and engine builders recognize that nobody builds a better rod bolt than ARP.