Quote:
Originally Posted by HoneyBadgerRy
The last thing I have to say about porting is think about what has been done to the motor. A stock motor will not want the same size valves and ports as a bored stroked high compression motor with a free flowing exhaust.
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This is key really. Most OEM heads will benefit from a little bit of clean up. Things like smoothing, port matching, minor clean up does little to change the airflow profile in terms of volume and velocity but rather removes little inefficiencies within that profile.
Major port reshaping and reconfiguration is a different animal and in many cases are going to need to be considered in conjunction with cam profiles, valve sizing, and intake and exhaust size, length, and shape.