The kit will include a full set of dual valve springs, Hemi specific light weight tool steel retainers, steel spring locators, and viton valve seals.  The cylinder head valve guides must be cut down to a .500" outside diameter and machined down to allow for the .670" max lift.  This valve spring kit is designed to be used with roller rocker arms that allow extra clearances at the valve spring retainer area.  Factory 5.7L or 6.1L rocker arms will not clear the spring retainers, and are NOT RECOMMENDED to be used with these springs.  Please consult with your engine builder and verify fitment of all components and proper clearances.