Fins play a critical role in enhancing heat transfer in thermal systems by improving the dissipation of heat between a solid surface and surrounding fluid. This study evaluates the thermal performance of rectangular and circular fins—both slotted and non-slotted—used for cooling engine piston chambers subjected to extreme thermal conditions. Using AUTODESK FUSION 360 for geometric modeling and ANSYS WORKBENCH for meshing and thermal analysis, simulations were conducted to assess temperature distribution and heat flux across different fin configurations. Results demonstrate that slotted circular fins, particularly with a 3 mm thickness, offer superior thermal performance compared to other designs. These fins provide more effective heat dissipation, contributing to reduced thermal stress and improved engine cooling. The study highlights the significance of fin geometry and slotting in optimizing thermal management for high-heat applications