Pareja de cilindros con pistones y valvulas , esta modificada reforzada la base no se la razon , . para HARLEY DAVIDSON VL / VLD / VLC / VFD / VDS aos 1930 a 1933 Pair of cylinders with pistons and valves the base has been modified and reinforced reason unknown. For HarleyDavidson VL / VLD / VLC / VFD / VDS models , years 1930 to 1933 .