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

SKU: CP877

$304.86 USD $349.82 USD

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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. Please see vehicle fitment tab below to ensure accurate fitment.  



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 extreme 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. 

    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 the 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 discount?

    We do offer military discount. 

    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. 

    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)

    • 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

    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.

    Customer Reviews

    Based on 61 reviews
    Joe Giesbrecht (Calgary, CA)
    LB7 Duramax

    I already installed the studs and seem to hold up well. Honestly i would prefer running these studs any day for how much cheaper then other brands they are and work the same.

    Rick Martin (Leduc, CA)

    Thanks for the fast delivery and the studs are great. Thanks

    COY Bair (Orangeburg, US)

    Look like they are good quality, have not have time to install. Will let you know when I put it threw my test.

    Jim McMahon (Stanton, US)
    Seems to b a good deal.

    I was impressed with the shipping and time it took to get them. And the kit is complete with two sockets and a very nice Alen wrench. The only thing I am in question with is at the last round of torquing the nuts down the pressure on the treads began to seize and the studs would twist. So I am not sure that I got a accurate torque. That seems to be the problem with bolts and studs and perhaps why they do the final with stretch bolts. Perhaps there is a better lubricant for the threads…. Over all I loved the kit and convinces of having to tools to complete the job~

    Ethan Pehringer (Waukesha, US)
    Best headstuds money can buy!

    Huge fan of xotics products , have them on two of my trucks. Super good quality and attention to the little details. Including nice literature on torque sequences and directions. They include everything in the kit including sockets for the new studs , Allen wrench , and the assembly lube! Way cheaper than arp studs and xotic surpasses them in quality. Their customer service is second to none, I simply send an email and get back quick responses. Nothing but good things to say and couldn’t recomend them any more!!!

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