A 150 or 160 HP 152 would be a fun airplane, but I would want the extended range fuel tanks. All of the STCs for installing an 0-320 or O-360 in an A150 or A152 that I have researched limit operations to normal category only, i.e., they lose their aerobatic category certification. The non-aerobats are required to be be placarded against spins. I have talked to several owners of 150 HP A150’s who did not realize that their airplanes were no longer certified for aerobatics. The 152 tailwheel conversion has a longer takeoff roll thsn a tri-gear, and roughly the same landing distance. They are tough little airplanes, though, and a good value for someone who wants to fly a typr-certificated airplane. BJC Edit: If anyone knows of an STC for the 150/160 or 180 HP engine that retains the aerobatic certification, please identify it.