Manley, valve spring top collar set. Titanium. Thin stem

66-84 Shovelhead (NU). With thin stem valves only

For thin stem valves. Precision machined titanium valve spring top collars for Shovels that run thin stem valves. Manley suggests the use of titanium top collars on high lift applications to provide increased strength and reduced inertia mass which allows running higher R.P.M.'s without valve float.