Product Description
LOCK DOWN YOUR 4BT. The ARP 247-4206 Head Stud Kit for the 3.9L Cummins 4BT delivers the clamping force and repeatable torque your build needs to keep the head gasket sealed under boost, towing load, and heat. Built from proven ARP2000 alloy (~220,000 PSI tensile) with threads rolled after heat-treat, these studs resist stretch and maintain preload for reliable sealing and long-term durability.
- Engineered for Cummins 3.9L 4BT applications (industrial and swap builds).
- Studs, 12-point nuts, washers, and ARP Ultra-Torque lube packet included.
- Improved head gasket retention vs. TTY head bolts, ideal for boost and timing increases.
- Reusable when inspected and installed per ARP procedure.
Installation note: Per ARP’s instructions for kit 247-4206, minor rocker arm pedestal modification is required to accommodate the included shorter pedestal stud. Follow ARP’s torque sequence and lubricant guidance for best results.
Fitment
Designed for Cummins 3.9L 4BT (12-valve) engines used in industrial platforms and popular engine swaps. Not VIN/year-specific; confirm cylinder head and block configuration prior to installation.
Recommended ARP add-ons (cross-reference)
- ARP 247-4207 Custom Age 625+ 4BT Head Stud Kit – maximum strength alternative.
- ARP 100-9909 Ultra-Torque Assembly Lube (1.69 oz) – for accurate preload.
- ARP 100-9911 Ultra-Torque Assembly Lube (20 oz) – shop size.
- ARP 912-0001 Thread Cleaning Chaser (M8x1.25) – prep threads for consistent torque.
- ARP 247-5401 Main Stud Kit (select Cummins apps)
- ARP 247-5402 Main Stud Kit – 14mm (’89–’97 12V)
FAQ
Q: Do these replace torque-to-yield (TTY) head bolts?
A: Yes. Studs provide higher and more repeatable clamping vs. TTY bolts and are the preferred solution for boosted 4BT builds.
Q: Is any machining required?
A: ARP specifies a small rocker pedestal relief for one position to clear the included shorter pedestal stud. Follow the ARP instruction sheet for kit 247-4206.
Q: What lubricant and torque should I use?
A: Use ARP Ultra-Torque and follow the torque sequence/values in the ARP instructions for 247-4206.
Q: Will this fit my swapped 4BT?
A: If you’re running a standard 3.9L 4BT 12-valve cylinder head/block, this kit is the correct head fastener set. Verify any aftermarket head or deck modifications before install.
What’s in the box
- Complete set of ARP2000 head studs
- 12-point nuts & hardened washers
- Assembly lube packet & instructions
| Brand | ARP (Automotive Racing Products) |
| Part Number | 247-4206 |
| Application | Cummins 3.9L 4BT (12-valve) diesel |
| Material | ARP2000 (approx. 220,000 PSI tensile) |
| UPC | 672036044169 |
| GTIN | 672036044169 (GTIN-12 / UPC-A) |
| Shipping info | Typically ships same business day on in-stock orders placed by 2:00 PM ET from CPP Diesel. |
| Includes | Studs, 12-point nuts, washers, assembly lube, instructions |
| Cross reference | ARP 247-4207 (625+), ARP 247-5401 Main Studs, ARP 247-5402 Main Studs, ARP 100-9909 Ultra-Torque, ARP 100-9911 Ultra-Torque (20 oz), ARP 912-0001 Thread Chaser |
| E-codes | N/A (hardware fastener set) |
| Prop 65 | Yes — Cancer and Reproductive Harm: www.P65Warnings.ca.gov |
| Notes | Rocker arm pedestal modification required (see ARP instruction sheet for 247-4206). |
