Duramax 6.6L (2001-2016) Custom Age 625+ARP Head Stud Kit - Industrial Injection

ARP Custom Age 625+ Head Stud Kit – 2017–2025 6.6L L5P Duramax – 230-4302

ARP SKU: ARP230-4302
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ARP Custom Age 625+ Head Stud Kit – 6.6L L5P Duramax

The ARP Custom Age 625+ Head Stud Kit (230-4302) is engineered for 2017–2025 Chevrolet and GMC 6.6L L5P Duramax diesel engines. Designed for demanding, high-cylinder-pressure applications, this premium head stud kit provides increased fastening strength and improved resistance to fatigue compared to conventional cylinder head fasteners.

Manufactured from ARP's proprietary Custom Age 625+ super-alloy, these studs offer a nominal tensile strength of 260,000 PSI, making them an excellent choice for performance engine builds where maintaining consistent cylinder head clamping force is critical.

Whether you're rebuilding an L5P Duramax or preparing an engine for increased boost and cylinder pressure, ARP Custom Age 625+ head studs provide additional strength and security for the cylinder head assembly.

Features & Benefits

  • Custom Age 625+ Super-Alloy: Premium high-strength material with a nominal tensile strength of 260,000 PSI.
  • Increased Clamping Strength: Designed to support cylinder head retention under elevated combustion pressures.
  • Excellent Fatigue Resistance: Engineered to withstand repeated loading and demanding engine operating conditions.
  • Precision Manufacturing: Centerless-ground studs with threads rolled after heat treatment to optimize fatigue strength.
  • Corrosion Resistance: Custom Age 625+ material offers excellent resistance to atmospheric corrosion and oxidation.
  • Reusable Stud Design: Unlike factory torque-to-yield head bolts, ARP studs are designed to be reusable when properly inspected and installed according to ARP specifications.
  • 12-Point Fasteners: Includes chrome-moly steel 12-point nuts and precision-ground washers for proper load distribution.
  • Application-Specific Design: Engineered for the GM 6.6L L5P Duramax cylinder head configuration.

Kit Includes

  • 36 M12 ARP Custom Age 625+ head studs
  • 36 chrome-moly steel 12-point nuts
  • 36 parallel-ground washers
  • 12 M10 ARP 8740 chrome-moly intake valley bolts
  • ARP Ultra-Torque fastener assembly lubricant

Vehicle Fitment

Fits the following vehicles equipped with the 6.6L L5P Duramax diesel engine:

  • 2017–2025 Chevrolet Silverado 2500HD
  • 2017–2025 Chevrolet Silverado 3500HD
  • 2017–2025 GMC Sierra 2500HD
  • 2017–2025 GMC Sierra 3500HD

Engine: GM 6.6L Duramax L5P

ARP Part Number: 230-4302

Installation Information

Proper installation is essential to achieving the intended clamping force and performance of ARP head studs. Follow the installation instructions provided by ARP for part number 230-4302, including the specified thread preparation, lubrication, torque sequence, and torque values.

ARP Ultra-Torque fastener assembly lubricant is included with the kit and must be applied to the specified surfaces according to the manufacturer's instructions.

Important: Always follow ARP's installation instructions rather than factory head bolt torque specifications. Cylinder head gaskets are sold separately.

Download ARP 230-4302 Installation Instructions (PDF)

Why Upgrade to ARP Custom Age 625+?

Factory torque-to-yield head bolts are designed around original engine operating requirements. When cylinder pressure increases beyond factory levels, additional cylinder head clamping strength can become important.

ARP Custom Age 625+ head studs provide a higher-strength fastening solution for performance-oriented L5P Duramax engines. Their material properties, precision manufacturing, and fatigue resistance make them well suited for builds where cylinder head sealing and fastening reliability are priorities.

For questions about selecting the correct head studs for your L5P Duramax, contact Industrial Injection at 800-955-0476.
Shipping information

Free economy ground shipping on most orders over $200. This includes lower 48 United States only. Excludes products that must ship freight.

Core Return Info

Read Carefully!

When you purchase a product from our website that has a core requirement, you have two options:

1. You choose to pay the core charge and we will ship the product right away, then once we receive the cores you will be refunded the core charge if your cores pass our inspection qualifications. This is the preferred choice and has the least delays. 

2. You choose to send in your cores before we ship the product that was purchased. This choice has the risk of delayed shipment of your purchased product and our inventory is not guaranteed by the time we receive your cores. You will need to follow all of the instructions below as quickly as possible so that you can get your purchased product and we can receive the cores. When you choose this option you acknowledge that by the time we receive your cores, our inventory could have change and there could be a delay in your shipment. 

 

Please return all cores to:



Industrial Injection Core Returns
2858 South 300 West
Salt Lake City, Utah 84115

INCLUDE RA# THAT WAS ISSUED AT TIME OF PURCHASE! If RA # is lost, please call Customer Service at (800) 955-0476. Have your original invoice at time of phone call to give all appropriate information for return.

Core return freight is the responsibility of the customer

FULL CREDIT WILL BE GIVEN WHEN: 

In order to receive full core credit, your core(s) must be returned within 90 days from receipt of order. It must be as is “off the engine.” Full core credit will be given if core meets acceptance criteria. Cores that are damaged during shipment to Industrial Injection are the responsibility of the customer and their shipping company.

½ CORE CHARGE CREDIT WILL BE GIVEN WHEN:

  • Slightly damaged housing or camshaft
  • Missing parts such as FCA

No Core Credit issued when:

  • Core is seized or hydraulic head is cracked
  • Excessive damage ( Heavy use of Bio-diesel and rust are common causes for unacceptable core)
  • Core is fire damaged
  • Core is returned after 90 days/3months

Please do the following when returning a core:

  • Make sure you have removed all fittings from your old unit
  • Drain all fuel and oil from unit
  • Package cores so that fuel and oil does not escape from the package

NOTE: packages that have fuel or oil residue on the outside of the box during shipping will not be delivered by UPS or the postal service which will cause delays.

  • Please re-use boxes and bags that parts were shipped in originally. These boxes are UPS approved to reduce damage while being handled in freight.
  • All shipping charges are the responsibility of the customer
  • Please write on the box “Core Return” and have RA # clearly written on the outside of box
  • Include copy of original invoice and RGA inside box

PLEASE RETAIN RA#, INVOICE # AND TRACKING NUMBER UNTIL CREDIT IS RECEIVED BY YOU. We do not research by customer name, only invoice # or RA #.
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