Product Description
UNCOMPROMISING CLAMP LOAD FOR BIG-BOOST DURAMAX BUILDS. ARP’s Custom Age 625+ head stud kit (PN 230-4202) delivers extreme tensile strength—engineered to keep 6.6L Duramax heads sealed under the highest cylinder pressures. Precision centerless-ground studs with rolled threads after heat-treat provide superior fatigue life and consistent torque, helping prevent head lift and head gasket failure on hard-working LB7, LLY, LBZ, LMM, and LML engines. If you’re chasing reliability at 700–1,500+ HP or towing heavy with elevated boost, this is the proven fastener upgrade your build needs.
For street/ tow and moderate builds, compare with the ARP2000 version: ARP 230-4201 Head Stud Kit. Round out a bulletproof bottom end with matching ARP 230-5401 Main Studs (LB7/LLY), ARP 230-5402 Main Studs (LBZ/LMM), and ARP 230-6301 Rod Bolts. For driveline security, add ARP 230-2901 Flexplate Bolts.
WHAT ENGINES DOES 230-4202 FIT?
2001–2016 GM 6.6L Duramax: LB7, LLY, LBZ, LMM, LML.
WHY CHOOSE CUSTOM AGE 625+ OVER ARP2000?
625+ offers a higher minimum tensile strength (approx. 260,000+ psi class) for extreme boost/horsepower builds where head lift risk is greatest.
ARE GASKETS OR MACHINING REQUIRED?
Use with quality MLS head gaskets and verify surface finish/flatness; machine work may be required to meet gasket manufacturer specs.
WHAT LUBE AND TORQUE PATTERN SHOULD I USE?
Follow ARP’s printed instructions included with the kit (use ARP Ultra-Torque and the specified step-torque sequence).
Fitment Details
- 2001–2004 Silverado/Sierra 2500/3500 6.6L Duramax LB7
- 2004.5–2006 Silverado/Sierra 2500/3500 6.6L Duramax LLY
- 2006–2007 Silverado/Sierra Classic 6.6L Duramax LBZ
- 2007.5–2010 Silverado/Sierra 2500/3500 6.6L Duramax LMM
- 2011–2016 Silverado/Sierra 2500/3500 6.6L Duramax LML
Cross Reference & Related ARP Parts (CPP)
- ARP 230-4201 Head Stud Kit – ARP2000 (Duramax 2001–2016)
- ARP 230-5401 Main Stud Kit – LB7/LLY (2001–2005)
- ARP 230-5402 Main Stud Kit – LBZ/LMM (2006–2010)
- ARP 230-6301 Rod Bolt Kit – LB7/LLY/LBZ/LMM (2001–2010)
- ARP 230-2901 Flexplate Bolt Kit – 6.6L Duramax (2001–2010)
- ARP 230-4301 Head Stud Kit – L5P (2017–2021)
Specifications for ARP 230-4202
| Brand | ARP (Automotive Racing Products) |
| Part Number | 230-4202 |
| UPC | 672036035853 |
| GTIN | 672036035853 |
| Shipping Info | Calculated at checkout; package dims approx. 10.00" (D) × 8.00" (W) × 4.00" (H) |
| Cross Reference | 230-4201 (ARP2000) • 230-5401 (LB7/LLY Main Studs) • 230-5402 (LBZ/LMM Main Studs) • 230-6301 (Rod Bolts) • 230-2901 (Flexplate Bolts) |
| E-Codes / Emissions | Not emissions-related; no CARB EO required |
| Prop 65 | WARNING: Cancer and Reproductive Harm. For more information, see product packaging. |
| Included | Custom Age 625+ studs, 12-point nuts, hardened washers, ARP Ultra-Torque lube, instructions |
