I have the 180 CS conversion in a 175B. It's short filed performance is
great compared to the 172. Cruise speed is not that great. A friend of mine
has a 69 172 with the O-320. We run even in cruise with him at 65% power and
me at 55%. Fuel at 75% cruise is about 9.5GPH. When time for overhaul, 4
cyclinders are cheaper than 6. Still, I don't think I would do the
conversion, I'd sell the plane and buy one equiped the way I want it unless
I had someone wanting to buy the old engine for a good enough price to make
it worth while, not likely.

Wayne

"EDR" wrote in message
...
In article , Rosspilot
wrote:
I have the 145 HP Cont O-300 . . . would LOVE to get to 180 HP . . . can
it be
done?

Why would you want to go from a smooth running, fuel sipping six
cylinder to a vibrating, fuel gulping four cylinder?