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The development of combustion system using a cast head normally takes quite a long time and quite an amount of money even if a single cylinder facility is used. The application of rapid prototyping technology to the combustion system development can reduce the time and cost of the development due to the elimination of a wooden pattern and casting process. The aim of combustion system development (specially port development) is to impart proper turbulence intensity around the spark plug at the right time. There are large body of data correlating the results of steady state flow rig test with engine performance. From port and combustion chamber CAD data, a resin model was made using stereo lithography apparatus(SLA). Flow rate and swirl strength were measured with the steady flow test rig, and the resin model was modified using file and clay until the satisfactory flow and swirl characteristics for the specific engine performance are obtained.