The macrostructure casting a direct effect on its mechanical properties. Porosity and homogeneity correlation with the strength characteristics. In order to achieve the best mechanical properties of the cast it is necessary to eliminate the internal defects of the cast. Elimination can be achieved by suitable adjustment of input parameters pressure die casting machine before starting the actual casting cycle. This method is useful for companies that produce castings supplied under pressure forms when it is impossible to influence the design of gating systems. A much more favorably influence the homogeneity of the casting design of the running system such that the gaps can be underpinned and eliminated already at the design and development phase. By adjusting various elements of gating system we can achieve a significant effect on the properties of the casting. The biggest influence on the final homogeneity, the construction of the inlet notch. Notch in the pouring stream occurs modulation of the melt and increase the rate of melt, which is filled mold cavity shape. Just filling of the cavity mode and melt flow rate characteristics indicate the nature of the final casting. The present paper deals with the analysis drawn up macrostructures castings for various structural modifications of the inlet slit and their effect on the mechanical properties of the casting. Based on analyzes of the conclusions drawn describing the correlation macrostructures and mechanical properties of casting with measures for practice implemented directly in production.