ARP 247-4207 CUSTOM AGE 625+ HEAD STUD KIT FOR 3.9L CUMMINS 4BT

Product Description

ARP 247-4207 HEAD STUD KIT – CUSTOM AGE 625+ FOR 3.9L CUMMINS 4BT delivers extreme clamping force and reliability for hard-working 4BT and 4BTA 8-valve builds. Manufactured in the USA from ARP’s Custom Age 625+ alloy and rated to a massive 260,000 psi minimum tensile strength, this kit is engineered to keep your head gasket sealed under big boost, compounds, nitrous, and heavy tow duty. Expect precise fitment, broached ends for easy installation, premium 12-point nuts, and hardened washers—everything you need to button up a leak-free top end that stays torqued and true.

ARP 247-4207, ARP CUSTOM AGE 625+, CA625+, 3.9L CUMMINS 4BT HEAD STUDS, 4BTA HEAD STUD KIT, 260K PSI, DIESEL PERFORMANCE, CYLINDER HEAD STUDS, 8-VALVE CUMMINS, HEAVY DUTY FASTENERS

Fitment Details

• Cummins 3.9L 4BT & 4BTA (8-valve) diesel engines (industrial, swap, performance applications)
• Direct replacement upgrade for OEM head bolts on 4BT/4BTA platforms

What’s Included

• Complete set of Custom Age 625+ head studs
• 12-point nuts and hardened washers
• Assembly lubricant

Cross-Reference / Related ARP Products (CPP Only)

• ARP 247-4206 – Standard 3.9L 4BT Head Stud Kit
• ARP 247-4203 – 1989–1998 5.9L 12-Valve Head Stud Kit
• ARP 247-4205 – 1994–1998 5.9L 12-Valve 625+ Kit
• ARP 247-4204 – 1998.5–2024 5.9L/6.7L 24-Valve 625+ Kit

FAQ

Q: Why choose the Custom Age 625+ series over standard studs?
A: 625+ provides substantially higher tensile strength (approx. 260 ksi) and superior fatigue resistance for high-boost and competition builds.

Q: Do these studs help prevent head gasket failure?
A: Yes—higher clamp load and better material stability help minimize head lift and maintain gasket seal under extreme cylinder pressures.

Q: Are special tools required?
A: Typical hand tools plus sockets for the 12-point nuts; broached ends aid installation. Follow ARP torque specs and sequence for best results.

Q: Is there a CARB EO or emissions compliance code?
A: Not required—fasteners do not modify emissions controls.

Specifications for ARP 247-4207