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Abstract: The combustion chamber of engine cylinder of motor cycle is subjected to a high temperature and thermal stresses, on which fins are, mounted in order to cool the cylinder, fins are provided on the cylinder to increase the heat transfer rate. In this report thermal analysis of engine block with fins were analysed. By doing thermal analysis on cylinder block fins, it is helpful to know the heat dissipation inside the cylinder. The principle behind the cooling of the cylinder block is to extend the fins over the cylinder block by which the heat transfer rate will be increased. The parametric model of engine block fins has been developed in 3D software Solid works and thermal analysis is done on the fins with groove and fins without groove with and the block to determine temperature variation in transient state and in steady state that is, with and without consider over time. The Thermal analysis is done by using ANSYS software. Analysis is conducted with varying material also. In this thesis report two model were created in software and modified design of the same model were analyzed, and comparison of two models according to geometry and material wise analyzed.