Prius Pistons

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I can almost guarantee you, you'd be doing more harm then good by swapping to otto cycle cams in your engine. The prius is mainly powered by the electric engine, so to make that as efficient as possible the torque output on the gas engine needs remain a constant. The numbers I listed were WAG and so probably not accurate. Remember your gas engine isn't directly connected to the wheels, so its RPM's are also not a contant

Here is a website that explains how the HSD powersplit device works. Website

Upping the power on the gas engine doesn't help as much as you'd think since only torque at certain rpms provides assist. Since the engine only revs to 5k you'll be throwing away all the constant torque of the fxe to gain the peak torque of the fe all with major loss and no benefits. You have to think of the gas engine as a electricity generator/backup power unit rather than a PU. You can rev the nuts off the Prius engine and the car won't move unless the electric motor is moving.