This package has Kibblewhite, “KPMI” Stainless steel valves combined with their heavy duty dual spring kit, titanium retainers, and hardened spring locators. Can be used as an alternative to OEM titanium valves but are heavier and can reduce power by 5% to 10%. We suggest our FH pkg that uses a robust titanium valve from Del West. They will last longer than stainless steel without the decrease in power.