Abstract: A cast alloy article suitable for improving the combustion characteristics and efficiency of a liquid fuel is disclosed. This cast alloy article is chiefly characterized by having coarse and irregular surface contour of interspersed peaks, valleys and pores that provide for increased surface area for increased fluid contact and provide for increased turbulence in fluid flow. The article has interspersed dendritic areas of solid dendrites and interdendritic areas of solid metal that also provide maximum surface area contact and turbulence of fluid flow of a fluid that is passed over the surface thereof. This article is made by heating selected quantities of selected metals including copper, zinc, nickel and tin to a temperature of above about 2000.degree. F. but not in excess of 2400.degree. F. intermixing the heated metals, pouring the heated metals into sand mold of a particular mesh to accomplish a coarse and irregular contour with pores and retaining the poured body at a temperature between about 2000.