The microstructure of Al–7Si alloy consists of large elongated primary α´-Al grains and the eutectic silicon (plate like) induces poor ductility to the casting. The addition of grain refiners (Al–1Ti–3B) and modifier (Sr) converts large α´-Al grains into fine equiaxed α´-Al grains, eutectic silicon (plate like) into fine particles and fine CuAl2 particles in the interdendritic region resulting in the improved mechanical properties. The improvements which are observed in the present studies are mainly due to structural differences between the grain refined, modified and combined effect of grain refiner and modifier in these alloys. It is important to note that; the alloy has been cast in a graphite mould surrounded by fireclay brick (slow cooling) after grain refinement and modification. Thus, further improvement in the mechanical properties can be expected for fast cooled castings, as this can lead to further refinement of the microstructures.