Recent trends exhibit high interest in increased efficiency, fuel consumption, exhaust emissions and the power of automotive engines, which leads engine manufacturers/companies to further enhance engine productivity. In order to comprehend and capture the proper functioning of any engine, it is indispensable to have the knowledge of temperature and stress distribution of different parts of the engine while it is operative. The objective of this study was to apprehend the realistic temperature and stress variation on the exhaust and inlet valves while a turbo charged diesel engine is at high speed. A 3D model of the exhaust and inlet valves based on realistic dimensions was fabricated. The thermal and stress analysis was done using Finite Element Method by employing the tetrahedral meshing on the valve models.