Speedmaster engine studs are premium-grade, race-quality studs that are created from aircraft quality 8740 high tensile strength chromoly steel,
withstanding up to 190,000 PSI .'They are ground and thread-rolled after heat treatment to ensure the exacting tolerances that Speedmaster
requires for all of their fasteners. This ensures strength & consistent torque readings. All kits come complete with 4130 heat-treated parallel-ground
washers and high-strength 12-point nuts.