ARP Custom Age 625+ 12pt Head Stud Kit for Ford EcoBoost (2.3L)

Secure your cylinder head against extreme combustion pressures with the ARP Custom Age 625+ Head Stud Kit, engineered specifically for the Ford 2.3L EcoBoost engine. For builds pushing high boost levels or high-compression ratios, factory torque-to-yield (TTY) head bolts often reach their elastic limit, leading to head lift and head gasket failure. This CA625+ kit provides the superior clamping force necessary to maintain a perfect seal under the most demanding conditions.

Custom Age 625+ is a super-alloy with a typical tensile strength of 260,000 to 280,000 psi, offering significantly higher fatigue life and toughness compared to standard ARP2000 or 8740 fasteners. These studs are thread-rolled after heat-treat for maximum fatigue strength and are centerless ground to ensure perfect concentricity. The 12-point nut design allows for easier socket access in the tight confines of the EcoBoost cylinder head.

• Fits Ford 2.3L EcoBoost engines
• Material: Custom Age 625+ Super-Alloy
• Tensile Strength: 260,000 - 280,000 psi
• Fastener Style: 12-Point Nuts
• Includes: Precision-machined head studs, 12pt nuts, hardened parallel-ground washers, and ARP Ultra-Torque assembly lubricant