Head Stud Replacement Kit | 2001-2016 6.6L LB7 LLY LBZ LMM LML Chevy Duramax Diesel CP877

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Vehicle Fitments

LB7 (Found in 2001 - Early 2004 models, 8th Digit of VIN is 1) 
LLY (Found in Late 2004 - 2005 models, 8th Digit of VIN is 2)
LBZ (Found in 2006 - Early 2007 models, 8th Digit of VIN is D)
LMM (Found in Late 2007 - Early 2011 models, 8th Digit of VIN is 6)
LML (Found in Late 2011 - Current models, 8th Digit of VIN is 8)


Package Content

36x Heads Studs (M12 x 142mm) 
36x Nuts (M12)
36x Hardened Parallel Washer
8x Rocker Bolts (M8 x 97mm) 
2x Sockets (10mm and 16mm) 
1x Allen Wrench (5mm)
1x Fastener Assembly Lubricant
1x Instruction Manual

    Head Studs Vs. Head Bolts

    In every diesel car, there are high cylinder pressures that can damage head gaskets. Factory OEM head bolts are torque to yield, meaning you torque the bolt to a specific torque with a final 90-degree rotation that will place the bolt at its’ maximum stretch point.


    Our observation through years of dealing with trucks is that when you add parts that increase horsepower (turbocharger, injectors, chips etc.), you risk creating higher cylinder pressures lower than your RPM range, consequently leading to a blown head gasket.


     In contrast to head bolts, head studs are engineered to not stretch. Xotic Performance head studs are created using premium steel alloys (XOTIC 7200) that are far superior in tensile strength to a bolt. Our head studs are threaded on top to allow for nut placement which will result in a more accurate torque of the head.


    Rather than blowing your head gasket again, we highly recommend replacing your head gaskets with fasteners that have a proven track record of not stretching - so that you never have to deal with the exhaustive procedure of replacing another failed head gasket.



    XOTIC 7200 material properties allow for far greater tensile strength compared to 8740 Chromoly steel head studs. Threads are rolled after heat treatment for optimum fatigue strength. Premium quality inspection standards ensure you'll never get a blow head gasket again.  



    Broached stud ends install & make cylinder head removal easier. Engineered to unleash more performance out of your vehicle. Ample clamping strength prevents cylinder heads from lifting. 



    Head studs are designed to retain cylinder seal even with today's extremely high-pressure turbo systems. These studs far exceed clamping forces provided by standard Duramax head bolts.



    36x Heads Studs, 36x Nuts, 36x Hardened Parallel Washer, 8x Rocker Bolts Fastener Assembly Lubricant & Instructions Manual. Black oxide finish protects from wear and tear. Hardened parallel washers allow for uniform load distribution and accurate torque readings.




    All details including torque recommendations are included in the manual for your reference. 


      Customer Reviews

      Based on 71 reviews
      David Alleman (Tok, US)

      Head Stud Replacement Kit | 2001-2016 6.6L LB7 LLY LBZ LMM LML Chevy Duramax Diesel CP877

      Jeff McGuire
      Awesome product

      Ordered a set of head studs for a customer’s Lb7 duramax from Xotic and both him and myself couldn’t be any more pleased with the quality. Every job prior to using Xotic’s head studs I’ve only ever used ARP products and even though I’ve never had any issues the price’s have kept going up even at a dealers cost. Initially I was hesitant to try any other brands especially due to the fact that if there’s any issues with the product your basically starting over. Once I received these studs I was highly impressed with the quality and how well they torqued. The truck these were installed on has a 65mm turbo with 75hp injectors backed by a built trans with max effort efi live tuning. The customer works the truck heavily both hauling and daily and so far no issues whatsoever after 6,000 miles. I’m now convinced that xotic’s product are on par with any other brands out there and as long as they offer a fair price like they do then from now on they will continue to be my go to for every job from now

      Tony Togeretz (Abbotsford, CA)

      Would be nice to have a clean out tap with this set

      Antoine Pageau-Pouliot (Montreal, CA)
      Great product

      Always put some xotic stud on head gasket job!

      Orville Crespo (Atlanta, US)

      Head Stud Replacement Kit | 2001-2016 6.6L LB7 LLY LBZ LMM LML Chevy Duramax Diesel CP877

      Frequently Asked Questions


      Do you have any certificate/tensile strength exam that can attest to the tensile strength you advertise?

      Yes, please click on the following link for a tensile strength report by Atrona Labs. We test our head studs extensively to ensure premium quality standards. The video demonstrated in this short preview highlights one of many spot inspections performed for our head studs. 


      Why choose Xotic Performance head studs over other head studs?

      The answer is simple - our long-term vision is to provide premium performance products at an affordable price any car enthusiast can afford. We understand we're a relatively new company, but that doesn't change the quality of products you receive. Our head studs have been put to the test by the thousands, and we can assure you you're getting quality for an affordable price. 


      Do you offer military discounts?

      We do offer military discounts. 

      Please fill out the following form: https://www.xotic-performance.com/pages/military-discount


      Are these head studs reusable? 

      If you performed the original install following the torque sequence correctly as highlighted in our manual, and there are no visible signs of damage, they can be re-used.


      Do these head studs come with paperwork? 

      Detailed instructions are included as part of the kit. 


      Does the kit include an assembly lube?

      Yes. Assembly lubricant is included as part of the kit. 


      What is the tensile strength?

      220,000-240,000 PSI. 


      What material are they made of? 

      XOTIC 7200 head studs are made from premium steel alloys that allow for far greater tensile strength compared to 8740 Chromoly steel head studs.


      Do these come with instructions/torque sequence for replacing 1 at a time with the heads on?

      This kit includes instructions with torque spec and sequence.