1. A method for controlling distortion of a turbine case, said method comprising: measuring a temperature distribution for the turbine case, the temperature distribution comprising a plurality of thermal gradients; modeling a plurality of thermal stresses on the turbine case induced by the thermal gradients; calculating an out of roundness index resulting from the thermal stresses on the turbine case; comparing the out of roundness index with at least one distortion limit; and controlling the temperature distribution until the out of roundness index satisfies the distortion limit.