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The flow performance of the helical intake port has great influence on DI diesel engine combustion and performance and so the helical port is usually an important, well-designed and sophisticated engine part. However, many errors or deviations may occur during the casting and machining processes. In this paper, a few sets of mechanism were designed for simulating different kinds of port deviation e.g., port with inclination, vertical swelling and eccentric errors etc. The flow performance of the port was tested on a steady state flow rig to verify how and to what extent the errors or deviations affect the flow performance of the helical inlet port in order to improve the production precision so as to insure good engine performance.