The invention concerns improvements to a method for producing cast-iron parts with a section having an outer contour which is helically symmetrical to an axis of symmetry such that these parts can be more simply produced and hence more economically. According to the invention, a pattern (84) comprising the section (16) with a helically symmetrical outer contour is shaped so as to produce a casting mould body (50) which surrounds this section azimuthally to the axis of symmetry and in an enclosed manner, and a casting (10), which corresponds to the part to be manufactured, is produced with this casting mould body (50) in a casting mould (44) by tempering which leads to solidification of the cast-iron melt shell.