Product Description
The ARP 247-5402 14mm Main Stud Kit is a proven bottom-end upgrade for 1989-1997 Dodge Ram 5.9L Cummins 12-valve engines. Designed to improve main cap clamping and reduce cap walk under heavy load, this kit helps strengthen the lower end of your Cummins for towing, performance, and high-horsepower diesel applications.
Manufactured from premium 8740 chromoly steel and heat-treated to a 190,000 PSI tensile strength rating, the ARP 247-5402 kit provides superior durability and more consistent clamping force than factory hardware. These 14mm main studs are ideal for engine rebuilds, competition builds, towing setups, and street-driven 12V Cummins trucks running increased cylinder pressure.
FEATURES
- Designed for 1989-1997 5.9L Cummins 12V engines
- 14mm main stud configuration
- 8740 chromoly steel construction
- 190,000 PSI tensile strength rating
- Helps reduce main cap walk and fretting
- Improves bottom-end stability in high-load applications
- Protects engine block threads compared to repeated bolt service
- Threads rolled after heat treatment for improved fatigue strength
- Includes studs, nuts, washers, lubricant, and instructions
FITMENT
- 1989-1993 Dodge Ram 250/350 5.9L Cummins 12V
- 1994-1997 Dodge Ram 2500/3500 5.9L Cummins 12V
- Fits 14mm main applications only
Fitment Note: This kit is intended for 12-valve Cummins applications with 14mm main hardware. Verify engine configuration before ordering.
WHAT'S INCLUDED
- ARP 14mm main studs
- ARP nuts
- Hardened parallel-ground washers
- ARP assembly lubricant
- Installation instructions
CROSS-REFERENCE & RELATED PRODUCTS
- ARP 247-4203 Head Stud Kit for 1989-1998 5.9L Cummins 12V
- ARP 247-4205 625 Series Head Stud Set for 1994-1998 5.9L Cummins 12V
- ARP 247-6303 Connecting Rod Bolt Kit
- ARP 147-2502 Harmonic Damper Bolt Kit
- ARP Diesel Fasteners
WHY UPGRADE TO MAIN STUDS?
Factory main bolts can allow cap movement and fretting under increased load, especially in engines running upgraded fueling, towing weight, larger turbochargers, or elevated RPM. ARP main studs provide improved clamping consistency and increased durability to help stabilize the bottom end of your Cummins engine.
SPECIFICATIONS
| Specification | Details |
|---|---|
| Manufacturer | ARP |
| Part Number | 247-5402 |
| Engine | 5.9L Cummins 12V |
| Fitment Years | 1989-1997 |
| Main Size | 14mm |
| Material | 8740 chromoly steel |
| Tensile Strength | 190,000 PSI |
| UPC / GTIN-12 | 672036034603 |
| Prop 65 | Warning: Cancer and Reproductive Harm — www.P65Warnings.ca.gov. |
FAQ
Will ARP 247-5402 fit my 12-valve Cummins?
Yes. ARP 247-5402 is designed for 1989-1997 Dodge Ram trucks equipped with the 5.9L Cummins 12-valve engine using 14mm main hardware.
What are the benefits of main studs over main bolts?
Main studs provide improved clamping consistency, help reduce main cap walk and fretting, and better protect engine block threads compared to repeated main bolt installation and removal.
What material are these studs made from?
ARP 247-5402 studs are manufactured from 8740 chromoly steel and heat-treated to approximately 190,000 PSI tensile strength.
Are these recommended for high horsepower or towing applications?
Yes. ARP main studs are commonly used in towing, competition, street performance, and high-cylinder-pressure diesel builds to improve bottom-end durability.
