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It depends on what the goals are....
For most of the cams that we run on street cars, with around .600-.620" lift, you'd never tell the difference between the 205 and 220/225 cc heads. In fact they flow similarly in the normal valve lift ranges. Also, when you can keep up flow without a lot of port volume, velocity increases....so in most cases the 205 head would be a best case scenario for a street car.
If you start adding higher lift cams and CNC porting, then it can become a different ballgame.
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