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Lots of design concepts for intake ports of SI engines have been introduced due to their significant effects on in-cylinder flow pattern and volumetric efficiency. However, those efforts have been made usually based on port experts' experience, which means that systematic analyses are not well established. As an attempt for improving the situation, an investigation has been performed to analyze experimental results and correlate them with port design parameters in this study. Twenty-eight SI engines, which cover a wide range of displacement volume from 1,000cc to 4,500cc, were tested to evaluate port Cf (Flow Coefficient). Except two small engines, these are four-valve engines with a pent-roof combustion chamber. The test results were analyzed with different port shapes, which were defined by several port design parameters. The parameters were chosen to be easily measured in the real intake ports and then re-defined for further analyses by appropriate non-dimensional arrangements.