Aeroflow Performance head studs greatly improve your cylinder head-to-block sealing capabilities. This is important in engines with high power adders such as turbochargers, superchargers or nitrous. They can even be a great addition to a mildly modified build as insurance against failure. All head studs provide a more accurate and consistent torque loading over traditional head bolts. These head studs are manufactured from aircraft quality 8740 high tensile strength chromoly steel and cold-forge