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Interference valve trains are better. That is why they are used. The ideal piston would be a flat top for the minimum surface area to pick up wasted heat. Squish zones and swirl patterns then deviate from that. Putting cut outs into the piston top makes it heavier, turbulent, fuel sticks to the cut outs, increases counterproductive surface area, ect. Big vaves make more power but also increase interference. Non interference engines are a trade off to be fail safe but are not technically as good.
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