Studs are made from heat-treated 8740 chromoly; polished headbolts are made from alloyed stainless steel Kit includes eight cylinder studs, eight head bolts, moly assembly lubricant and thread sealant Stock replacement; reusable studs and head bolts recommended for all V-Twin engines Precision J-formed threads prevent galling and promote more consistent torque loading Designed to exceed the needs of high-performance engines Manufactured by ARPĀ« to Feuling's exact specifications Stop head and base gasket failure Made in the U.S.A.. STUD KIT,EVO CYLINDER