ARP 244-4301 Custom Age 625+ Head Stud Kit for Gen III Hemi 5.7/6.1/6.4L

Vehicle Fitment

• Chrysler Gen III Hemi engines - 5.7L, 6.1L, and 6.4L variants; fitment confirmed through 2024; 2025 compatibility unverified

Features

• Custom Age 625+ super-alloy - ARP's advanced high-performance alloy
• Tensile strength approximately 260,000-280,000 psi - suitable for high-boost environments
• Pro Series manufacturing: cold-forged, heat-treated, thread-rolled after hardening
• Centerless-ground studs for exceptional concentricity
• Broached stud ends for easier cylinder head removal in tight spaces
• Proven to retain clamp load under 25 psi+ boost conditions
• Comprehensive socket interface compatibility - exact sizes per ARP spec (multiple metric options)
• Direct OEM fit - no head or block modifications required

Specifications

• Material: Custom Age 625+ alloy
• Tensile Strength: ~260,000-280,000 psi
• Manufacturing Process: Cold-forged → heat-treated → thread-rolled → centerless-ground → broached ends
• Applications: Chrysler Gen III Hemi 5.7L / 6.1L / 6.4L engines (Gen III platform)

Included Components

• Total studs: 30x (as per Gen III Hemi cylinder head count)
• Nuts and washers: included (Pro Series hardware)
• Assembly lube packet: included (Ultra-Torque or equivalent)

Product Description

The ARP 244-4301 Custom Age 625+ Head Stud Kit is engineered for Gen III Chrysler Hemi engines - specifically 5.7L, 6.1L, and 6.4L variants - built for extreme-duty applications and high boost performance. Utilizing ARP's proprietary Custom Age 625+ alloy, these studs deliver tensile strengths of 260,000-280,000 psi. Each stud is cold-forged, heat-treated, thread-rolled post-hardening, centerless-ground for concentric accuracy, and broached at the ends for easier removal - making them ideal for performance engines where dependability under high-pressure conditions is critical.

Tested and proven in high-boost builds exceeding 25 psi, this kit reliably maintains head clamp load under extreme conditions without requiring any modifications to your cylinder head or block. This all-inclusive performance upgrade includes the studs, hardened nuts, washers, and assembly lube. Fitment is validated for pre-2025 Gen III Hemi engines; compatibility with newer model years remains unverified.