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Legislation limiting NOx emissions from natural gas engines dictate a need for greater understanding of the mechanisms governing its formation, and more accurate models for predicting its dependence on the engine design and operating parameters. This work concerns the application of a one-dimensional, multi-zone, thermochemical model for calculating NO formations from a small bore, lean burning, natural gas engine. Because of the potential for significant non equilibrium behavior due to lean operation, high engine speeds and small combustion chamber sizes, detailed chemical kinetic mechanisms are used to integrate the reaction rates over the duration of the product combustion history. The model is used to predict NO emission at two lean conditions: ϕ = 0.91 and ϕ = 0.66.