The authors have conducted extensive finite element (FE) thermal and stress analysis on the heads of low heat rejection diesel engines. Throughout these analyses, model mesh construction was based on conventional rule-of-thumb criteria. In this paper a simple analytical methodology is presented for selecting a mesh to conduct thermal analysis. This is intended to remove some of the arbitrary appearance of these prior meshes. Results of the FE thermal solution based on a mesh using this methodology is compared to a known convergent FE thermal solution.