Product Description
LOCK DOWN YOUR L5P. The ARP 230-4301 Head Stud Kit is engineered specifically for the 2017–2021 GM 6.6L Duramax L5P, delivering the clamping force you need to keep head gaskets sealed under higher boost, towing loads, and hard use. Built from ARP2000 alloy with 12-point nuts and a black oxide finish, this kit is the gold standard for durability and repeatable torque—perfect for tuned daily drivers and work trucks alike.
Expect incredible strength, precise preload, and superior reliability thanks to ARP’s manufacturing, heat-treat, and quality-control processes. Every kit includes the correct fasteners, washers, and installation lube for a straightforward install with factory-style serviceability.
Recommended add-ons for a flawless install: ARP 100-9909 Ultra-Torque Assembly Lube, ARP 912-0001 Thread Cleaning Chaser, and for earlier Duramax generations ARP 230-4201 Head Stud Kit.
- Chevrolet Silverado 2500HD/3500HD — 2017, 2018, 2019, 2020, 2021 — 6.6L Duramax L5P
- GMC Sierra 2500HD/3500HD — 2017, 2018, 2019, 2020, 2021 — 6.6L Duramax L5P
- Engine family: GM Duramax L5P (VIN Y) 6.6L V8 turbo-diesel
- ARP 100-9909 Ultra-Torque Assembly Lubricant
- ARP 912-0001 Thread Cleaning Chaser (M8x1.25)
- ARP 230-4201 Head Stud Kit (2001–2016 Duramax)
- Shop All ARP at CPP Diesel
Q: What torque specs should I use?
Follow ARP’s instruction sheet for kit 230-4301 including prep with Ultra-Torque lube and the specified multi-step torque sequence for the L5P. Refer to the included instructions.
Q: Do I need to re-torque after heat cycles?
Many builders do not re-torque ARP2000 studs when installed per instructions with Ultra-Torque; follow ARP’s official guidance and your builder’s best practices.
Q: Will this fit LML or earlier Duramax engines?
No. This kit is L5P-specific (2017–2021). For earlier models use ARP 230-4201.
Q: Is head gasket replacement required?
Studs are typically installed during head gasket service or top-end builds. Always inspect surfaces and follow OEM/ARP procedures.
| Specifications for ARP 230-4301 | |
|---|---|
| Manufacturer | ARP (Automotive Racing Products) |
| Part Number | 230-4301 |
| Application | 2017–2021 GM 6.6L Duramax L5P (Chevrolet/GMC 2500HD/3500HD) |
| Material / Series | ARP2000 Alloy, 12-Point Nuts, Black Oxide |
| UPC | 672036049546 |
| GTIN | 00672036049546 |
| Includes | Studs, nuts, washers, ARP Ultra-Torque lube, instructions |
| Shipping Info | Orders placed before 2:00 PM ET typically ship same business day (in-stock). Carrier & cost shown at checkout. |
| Cross Reference | ARP 100-9909, ARP 912-0001, ARP 230-4201 |
| E-Codes | N/A (hardware/fasteners; no emissions calibration) |
| Prop 65 | Yes — Cancer & Reproductive Harm. See P65Warnings.ca.gov |
