Cylinder Head Bolts Kit for 2004+ Chevrolet Gen III IV LS Engines - XP981

SKU: XP981

$98.67 USD $149.89 USD

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***Please note, when installing our product, the final torque for the 11mm bolts are 75 ft-lbs and NOT 85 ft-lbs as incorrectly noted on our manual***

DIRECT FIT REPLACEMENT - Fits selected 2004+ Chevrolet Gen III IV LS Engines. Do not purchase until you have verified primary head bolt lengths (must all be the same length). Engineered to unleash more performance out of your vehicle. Centerless ground to assure perfect concentricity.

ULTRA STRENGTH - XOTIC 7200 alloy material properties allow for far greater tensile strength compared to standard bolts. Rated at 220,000 psi tensile strength. Threads rolled after heat treatment for optimum fatigue strength. Ample clamping strength prevents cylinder heads from lifting.

EASY INSTALLATION - Installation manual is included with drawn diagrams to ease the installation process. Our head bolts are designed to retain cylinder seal even with today's extreme high pressure turbo systems. These bolts far exceed clamping forces provided by standard head bolts.  

KIT INCLUDES - 30x Head Bolts, 30x Hardened Parallel Washer, 1x 10mm Hex Socket, 1x 13mm Hex Socket, 1x 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.

WORRY-FREE PURCHASE - Xotic Performance is dedicated to offering LIFETIME WARRANTY and full money back guarantee if you aren’t satisfied. Rigorous quality inspections are undertaken to ensure premium product standards.   

    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. 


    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. 


    Please note - primary head bolts must all have the same length. There is a Mid-Year split on the head bolts, if you have 2 different size head bolts this kit is NOT for YOU. 

    DO NOT PURCHASE until you have verified the primary head bolt length. 

    Chevrolet Gen III-IV/LS Series small block (2004 & later) w/ all same length hex bolts
    (2004-2014 Chevrolet LS1, LS2, LS3, LS6 (4.8L, 5.3L, 5.7L, 6.0L, 6.2L)

    • 30x Head Bolts (M11 x 113.7mm, M8 x 57mm) 
    • 30x Hardened Parallel Washers
    • 2x Sockets (10mm and 13mm) 
    • 1 x Fastener Assembly Lubricant 
    • 1 x Instruction Manual 

    Customer Reviews

    Based on 2 reviews
    Jonathan Eash (Topeka, US)

    Update to my previous review, Very Very impressed, got a email a day or so ago with a refund and new head bolts shipped out and they showed up today, the Xotic performance team does a incredible job taking care of there customers, 100% buying from them again

    Jonathan Eash (Topeka, US)

    They look like great head bolts, ordered a set and when torquing down to spec a bolt snapped, possibly a faulty bolt I don’t know, just ordered another set to give it one last chance

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