Callies Ultra Enforcer +2mm I Beam Connecting Rods For WRX-STI W- Multiphase ARP3.5 Bolts

• Increased mass & pressure angle archers guarantee added wrist pin stability
• Tough AMPCO 45 pin bushings intended for heavy load applications
• Machined from superior strength 4330, Vanadium enhanced steel
• Robust tower flanges provided enhanced resistance to bend and twist
• Extended mating faces and bolt gussets for superior bearing housing rigidity
• ARP3.5 Bolts
• Length: 5.217 / 132.5mm
• Journal: 2.047 / 52mm
• Pin: .905 / 23mm
• Set of 4

About ARP3.5 Multiphase Bolts: While similar to Inconel 718, these super-alloys are found in many jet engine and aerospace applications where heat and stress attack the life of critical components. The high cobalt content of this alloy, while expensive, delivers a material with superior fatigue characteristics and typically tensile strength in the 260,000-280,000 psi range. The immunity to hydrogen embrittlement and corrosion of these materials is a significant design consideration. These materials are primarily used in connecting rods where extremely high loads, high RPM and endurance are important factors – Formula 1, NASCAR and IRL applications.