Product Description
The ARP 247-5405 Main Stud Kit is engineered specifically for 2007.5-2018 Dodge Ram 6.7L Cummins engines equipped with the factory block stiffener or girdle. Designed to replace factory main bolts with premium ARP hardware, this kit improves bottom-end clamping strength, reduces main cap walk, and helps increase engine durability in towing, performance, and high-load diesel applications.
Manufactured from 8740 chromoly steel and heat-treated to approximately 200,000 PSI tensile strength, ARP 247-5405 main studs are designed to provide superior clamping consistency while helping protect engine block threads compared to repeated bolt service. This kit is ideal for high-horsepower builds, towing applications, upgraded turbocharger setups, and performance engine rebuilds.
FEATURES
- Designed for 2007.5-2018 6.7L Cummins engines with factory block stiffener or girdle
- 8740 chromoly steel construction
- Approximately 200,000 PSI tensile strength rating
- Improves bottom-end clamping force and durability
- Helps reduce main cap walk and fretting
- Provides more accurate torque loading than factory bolts
- Threads rolled after heat treatment for improved fatigue resistance
- Includes hardened washers, nuts, lubricant, and installation instructions
FITMENT
- 2007.5-2018 Dodge Ram 2500 6.7L Cummins
- 2007.5-2018 Dodge Ram 3500 6.7L Cummins
- 2008-2018 Ram 4500/5500 6.7L Cummins
- For engines equipped with the factory block stiffener or girdle only
Fitment Note: This kit is intended for 6.7L Cummins engines using the factory girdle or block stiffener plate. Engines without the factory stiffener require a different ARP main stud kit.
WHAT'S INCLUDED
- ARP main studs
- ARP nuts
- Hardened parallel-ground washers
- ARP Ultra-Torque fastener lubricant
- Installation instructions
CROSS-REFERENCE & RELATED PRODUCTS
- ARP 247-5401 Main Stud Kit Without Factory Block Stiffener
- ARP 247-4202 Head Stud Kit for 1998.5-2024 5.9L/6.7L Cummins
- ARP 247-4204 625 Series Head Stud Kit
- ARP Diesel Fasteners
WHY UPGRADE TO ARP MAIN STUDS?
High cylinder pressure, heavy towing, increased fueling, and elevated RPM can place tremendous stress on the lower end of a Cummins engine. ARP main studs provide superior clamping consistency and improved durability compared to factory bolts, helping stabilize the crankshaft and main caps under demanding conditions.
SPECIFICATIONS
| Specification | Details |
|---|---|
| Manufacturer | ARP |
| Part Number | 247-5405 |
| Engine Compatibility | 6.7L Cummins |
| Fitment Years | 2007.5-2018 |
| Configuration | With factory block stiffener / girdle |
| Material | 8740 chromoly steel |
| Tensile Strength | Approximately 200,000 PSI |
| UPC / GTIN-12 | 672036035129 |
| Prop 65 | Warning: Cancer and Reproductive Harm — www.P65Warnings.ca.gov. |
FAQ
Will ARP 247-5405 fit engines without the factory girdle?
No. ARP 247-5405 is designed specifically for 6.7L Cummins engines equipped with the factory block stiffener or girdle.
What material are these main studs made from?
ARP 247-5405 main studs are manufactured from premium 8740 chromoly steel and heat-treated to approximately 200,000 PSI tensile strength.
Why use main studs instead of factory bolts?
Main studs provide more consistent clamping force, help reduce main cap movement, and help protect engine block threads in high-load and high-performance diesel applications.
Are these recommended for towing and performance builds?
Yes. ARP main studs are commonly used in towing, racing, competition, and high-horsepower Cummins builds where improved bottom-end durability is critical.
