This paper reports on the modeling of turbulent reacting flow using the advanced Spectral Line Weighted-sum-of-gray-gases (SLW) method for prediction of the gas thermal radiative transfer. Predictions using the traditional weighted-sum-of-gray-gases radiation submodel are compared to the more advanced SLW treatment of radiation transfer. For the problem considered, the results reveal little difference in the predicted H2O and CO2 concentrations between the two radiation submodels. Further, the predicted furnace mass-averaged exit temperature for both radiation submodels is unchanged. However, there is considerable difference in the predicted radiative and thermal structure in the flame zone, albeit at considerably higher computational expense. The use of the more rigorous SLW model significantly affects the accurate resolution of the local radiative heating and local temperature in the flame region. It is concluded that the more advanced SLW model should be used when seeking to resolve accurately the detailed flame structure.