XP2 Head Stud Replacement Kit for 2001-2016 6.6L LB7 LLY LBZ LMM LML Chevy Duramax Diesel XP2-CP877 |ncludes Socket and Allen Wrench
DIRECT FIT REPLACEMENT - Fits selected 2001-2016 6.6L LB7 LLY LBZ LMM LML Chevy Duramax Diesel Models. Engineered to unleash more performance out of your vehicle. Centerless ground to assure perfect concentricity.
ULTRA STRENGTH - Rated at 260,000 psi tensile strength, our XP2 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. Ample clamping strength prevents cylinder heads from lifting.
EASY INSTALLATION - Broached stud ends install & make cylinder head removal easier. Installation manual is included with drawn diagrams to ease the installation process. 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 head bolts.
KIT INCLUDES - 36x Heads Studs, 36x Nuts, 36x Hardened Parallel Washers, 8x Rocker Bolts, 2x Sockets, 1x Allen Wrench, and 1x Fastener Assembly Lubricant. 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?
What material are they made of?
XP2 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 (XP2) 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.