 EVOMS High Strength Head Stud Kit Product Type: Engine Application: 997 Turbo | 997 GT3 | 997 GT3RS | 996 Turbo | 996 Turbo S/X50 | 996 GT2 | 996 GT3 | 2010 997 GT3 997 GT2 Price:$ 1395  Evolution Motorsports identified the problem with the OEM head studs through building and testing of high horsepower 996 Turbo and 997 Turbo models. The factory pieces will stretch over time as more boost and power are produced, leading to head gasket leaks and damaged components.  Design Inspiration: Most head gasket failures on these Porsche engines are due to the heads lifting from stretched or weak OEM or other aftermarket head studs. EVO has developed a direct replacement head stud kit that eliminates this problem. These head studs have been CAD engineered and implement critical design features for improved strength and durability. The materials undergo heat-treatment and test procedures including Torque-Tension, Tensile, Fatigue and Micrography to ensure consistency of each head stud that we produce. The stringent manufacturing process is carried out by companies with many decades of experience building the highest quality fasteners for the aerospace industry serving companies like Boeing, Bombardier, Dassault, GEAE, Pratt & Whitney, Rolls Royce, Euro Copter, Safran and automotive race teams such as Ferrari, BMW, Renault, TRD and many others. Benefits: · CAD Engineered in house with a - ZERO restriction - ground up approach for uncompromised quality · Better materials and better design equals a better head stud. This translates into better head clamping force · Direct replacement for the OEM head studs – No Machining Required · Utilizes the OEM flanged nuts · Engineered and manufactured in the USA Technical Details: · Manufactured with the highest grade - heat treated and stress tested H-11 tool steel · Utilizes 260KSI tensile strength material for optimum strength · Heat-treatment procedures are sealed and strictly controlled to ensure optimal consistency · 44 mm of thread length (engine case side) verses 24 mm of thread length (stock and other aftermarket studs) · 83.3% more thread surface contact with the engine case · Incorporates a machined “Dog Point” end at the case side of the stud · Bottoms out inside the engine case to disperse the thread load · Reduces engine case thread fatigue · Machined “HEX” broach at the end of the stud for easier installation · Machined with rolled threads for improved strength · Designed to use with the OEM flange nuts · Minimized thread length on the top of the stud for increased stud strength · 27% more clamping force than the leading brand head stud @ 80% torque yield · 38% more clamping force than the OEM head stud @ 80% torque yield · Capable of 15,244 lbs. of clamp force at 95% torque yield · Precise torque specifications / procedure for consistent clamp pressures Conclusion: Besides creating a stronger head stud, we incorporated features to make them easier to install and developed an installation procedure to help ensure proper head sealing. Our multi step torque process was developed to minimize installation torque variables and yield the most accurate clamp pressures. SharkWerks utilizes these head studs in all GT1-block motor builds.
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