Duramax Head Stud Kit 2001–2016 6.6L LB7 LLY LBZ LMM LML — Fits ARP 230-4201 — Heavy Duty Parts Co.

Duramax Head Stud Kit 2001–2016 6.6L LB7 LLY LBZ LMM LML — Fits ARP 230-4201 — Heavy Duty Parts Co. Clamp your heads down and keep them there. Built to hold the boost long after the factory bolts have given up. Heads up: This is the Heavy Duty Parts Co. head stud kit — our own take on the popular ARP 230-4201 setup. It is a direct-fit alternative built to the same job, not a genuine ARP product. The ARP part number is listed for cross-reference and fitment only. The factory torque-to-yield (TTY) head bolts are the weak link in every Duramax. They’re stretched past their yield point from the factory, they can’t be reused, and the second you add boost, fuel, or timing they start letting the heads lift — which is how head gaskets blow. This complete head stud kit replaces those bolts with through-hardened studs that deliver dramatically more consistent clamping force, so your heads stay sealed under the kind of cylinder pressure that destroys stock hardware. Studs also pull a truer, more even torque load than bolts, and unlike the factory TTY hardware, they’re fully reusable on your next teardown. This kit fits the 2001–2016 6.6L Duramax (LB7, LLY, LBZ, LMM, LML) only — it does NOT fit the 2017 L5P, which uses a different stud setup. Verify your engine code before ordering. Built Stronger Than Factory Forged from premium chromoly alloy steel and heat-treated to a 180,000 PSI tensile strength rating — engineered to the demands of high-horsepower diesel builds. Threads are rolled after heat-treat, not cut before it — the same process the top fastener houses use, giving the studs up to 10x the fatigue life of conventional cut-thread hardware. Centerless ground for perfect concentricity, so clamp load is distributed evenly across every fastener. Includes hardened 12-point nuts and parallel-ground washers for even load distribution and accurate, repeatable torque readings. Black oxide finish resists corrosion and oxidation in the engine bay. Fully reusable — not throwaway torque-to-yield hardware. Pull the heads down the road and these studs go right back in. Technical Specifications Condition: Brand New Application: 6.6L GM Duramax Diesel Material: Premium Chromoly Alloy Steel Tensile Strength: 180,000 PSI Thread Process: Rolled after heat-treat Hardware Included: 12-point nuts & parallel-ground washers Finish: Black oxide Sold As: Complete head stud kit for both cylinder heads Reusable: Yes — not torque-to-yield Cross-Reference: Direct-fit alternative to ARP 230-4201 (fitment reference only) Fitment Data Common Applications: 2001–2004 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD — 6.6L LB7 2004.5–2005 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD — 6.6L LLY 2006–2007 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD — 6.6L LLY / LBZ 2007.5–2010 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD — 6.6L LMM 2011–2016 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD — 6.6L LML [ ] Click to View Full Detailed Fitment List Year Make / Model / Engine 2001 Chevrolet Silverado 2500HD / 3500HD — 6.6L LB7 2001 GMC Sierra 2500HD / 3500HD — 6.6L LB7 2002 Chevrolet Silverado 2500HD / 3500HD — 6.6L LB7 2002 GMC Sierra 2500HD / 3500HD — 6.6L LB7 2003 Chevrolet Silverado 2500HD / 3500HD — 6.6L LB7 2003 GMC Sierra 2500HD / 3500HD — 6.6L LB7 2004 Chevrolet Silverado 2500HD / 3500HD — 6.6L LB7 / LLY 2004 GMC Sierra 2500HD / 3500HD — 6.6L LB7 / LLY 2005 Chevrolet Silverado 2500HD / 3500HD — 6.6L LLY 2005 GMC Sierra 2500HD / 3500HD — 6.6L LLY 2006 Chevrolet Silverado 2500HD / 3500HD — 6.6L LLY / LBZ 2006 GMC Sierra 2500HD / 3500HD — 6.6L LLY / LBZ 2007 Chevrolet Silverado 2500HD / 3500HD — 6.6L LBZ / LMM 2007 GMC Sierra 2500HD / 3500HD — 6.6L LBZ / LMM 2008 Chevrolet Silverado 2500HD / 3500HD — 6.6L LMM 2008 GMC Sierra 2500HD / 3500HD — 6.6L LMM 2009 Chevrolet Silverado 2500HD / 3500HD — 6.6L LMM 2009 GMC Sierra 2500HD / 3500HD — 6.6L LMM 2010 Chevrolet Silverado 2500HD / 3500HD — 6.6L LMM 2010 GMC Sierra 2500HD / 3500HD — 6.6L LMM 2011 Chevrolet Silverado 2500HD / 3500HD — 6.6L LML 2011 GMC Sierra 2500HD / 3500HD — 6.6L LML 2012 Chevrolet Silverado 2500HD / 3500HD — 6.6L LML 2012 GMC Sierra 2500HD / 3500HD — 6.6L LML 2013 Chevrolet Silverado 2500HD / 3500HD — 6.6L LML 2013 GMC Sierra 2500HD / 3500HD — 6.6L LML 2014 Chevrolet Silverado 2500HD / 3500HD — 6.6L LML 2014 GMC Sierra 2500HD / 3500HD — 6.6L LML 2015 Chevrolet Silverado 2500HD / 3500HD — 6.6L LML 2015 GMC Sierra 2500HD / 3500HD — 6.6L LML 2016 Chevrolet Silverado 2500HD / 3500HD — 6.6L LML 2016 GMC Sierra 2500HD / 3500HD — 6.6L LML Also fits 6.6L Duramax-equipped Chevrolet Express / GMC Savana vans within the years listed above. Fitment verification applies to year, make, and engine. Verify your engine RPO code before ordering.