Valve and Spring KitCaracteristicas: Stainless steel conversion kits include only whats needed to convert your head to the long life stainless steel Black Diamond intake valves Extend the life of the valve train and intake components by as much as 4x over the OEM titanium parts Valves are designed to not only offer the best life span over OEM, but also designed to flow and perform better than OEM components Components are created using Finite Element Analysis (F. E. A.)