In this project, we chose Optimization method as Optimization by Material. Present most used material for cylinder head is Cast Iron. We are replacing with different aluminum alloys as their densities are less than that of Cast Iron. Thereby the weight of the cylinder head reduces when aluminum alloys are used. In this project we are going to vary the materials LM6, LM24, LM25 different types of aluminum alloys. By varying above materials we are going to find out maximum optimal convection rate. We are going to conduct thermal analysis as a FEA. By using thermal analysis result we are going to conduct optimization analysis. The parametric model is done in CATIA and analysis is done in ANSYS