The main aim of this work is to predict the design performance based on stress/strain and Behaviour of cylinder head under various operating conditions. The effects of various engineering operating conditions such as combustion gas maximum internal pressure, thermal stress behaviour and fatigue stress of the cylinder head have been analysed. In any working engine, the piston and the cylinder head are the most vulnerable members due to increased mechanical and thermal loadings. The mechanical loading is mainly due to gas pressure in the gas chamber and its magnitude can be judged in terms of peak pressure. Thermal loading is due to temperature and heat transfer conditions in the piston surface cylinder liner and cylinder head. The geometry modeling was carried out using popular computer-aided engineering tools, CATIA V5R19 and the analysis was carried out using a finite element analysis (FEA) software package ANSYS. The result can be used to determine the quality of design as well as identify areas which require further improvement, and also the maximum stresses is found not exceeding material strength of cylinder head. In this work, we have also designed and compare two types of cylinder heads and formulated the importance of fins.The main aim of this work is to predict the design performance based on stress/strain and Behaviour of cylinder head under various operating conditions. The effects of various engineering operating conditions such as combustion gas maximum internal pressure, thermal stress behaviour and fatigue stress of the cylinder head have been analysed. In any working engine, the piston and the cylinder head are the most vulnerable members due to increased mechanical and thermal loadings. The mechanical loading is mainly due to gas pressure in the gas chamber and its magnitude can be judged in terms of peak pressure. Thermal loading is due to temperature and heat transfer conditions in the piston surface cylinder liner and cylinder head. The geometry modelling was carried out using popular computer-aided engineering tools, CATIA V5R19 and the analysis was carried out using a finite element analysis (FEA) software package ANSYS. The result can be used to determine the quality of design as well as identify areas which require further improvement, and also the maximum stresses is found not exceeding material strength of cylinder head. In this work, we have also designed and compare two types of cylinder heads and formulated the importance of fins.