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OR
you can have the same lift and duration, and build more aggressive ramps, so the valve sits longer on the 'nose' of the cam. Roller cams use this technique.
For instance, one cam's lobe looks 'pointy', so max lift +- 10% is realized for, say, only 20 degrees of rotation. (this is just an example!)
The other cam's lobe ramps up faster, then levels off to form a nice, wide nose on top. Max lift for this cam (+- 10%) is realized for 30% of rotation. Guess which cam makes more power?
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