Every single engine piston POH that I have specify "full throttle" for takeoff and for those with constant speed props, the max RPM.
Actually, no, not quite. I fly the GA8 with an IO-540. Takeoffs are done using 2500 rpm. In fact, 2500 rpm is the limit for all operations, except emergency. There is a detent in the blue lever that lets you get past 2500 rpm, but that travel range is marked for emergency purposes only.
2700 rpm gives about 30 more HP, but also considerably more noise. And that last thing is the reason for all this: All performance figures, including the noise measurements/certification, are based on 2500 rpm. With 2700 rpm allowed under all circumstances we would not be able to get the advantageous noise certificate we have now. Which significantly increases landing fees at some airfields.
But again, this is an exception. I do not know any other aircraft that has a reduced power setting as default in its POH.