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NEED INF ABOUT ATC TO CHANGE LYCOMING 160 HP TO 180 HP.
To my knowledge, there is no way to convert a 160 HP Lycoming O-320 to 180 HP. However, there are STC's to replace a 160 HP Lycoming O-320 Engine with a 180 HP Lycoming O-360 engine in the Cessna 172, Piper PA28, and Grumman AA-5 and AA-5A. Exactly what are you trying to do, and in what airplane?