These are a  set of  eight (8) preowned  DelWest  exhaust valves made from titanium and have a selling code of EV06. The valves measure 11/32"  at stem thickness,  with a head size measuring close to 1.540".  .The overall length is approximately 5.600" which is the best I could measure with the veriner calipers. The valves have a flat valve face. The valves pictured are the one's you will receive.  The bottom surface of the valves are a flat surface. The valves were used for testing on a dynomoter only.  These are vi Tage exhaust h st  alves and were used In  1998.. We appreciate your interest in our store and hope we can do business together. Thanks for looking! Please add us to your favorites.  These are older vintage valves.