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STC Lycoming O-320 A2A 150 to a 160

Have an 0-320 A2A that has been converted from 150HP to 160HP and need an STC. Does anyone know where an STC can be found for the A2A. THANKS!!!!
 
How was it changed? Pistons? Lycon engine STC requires nitride cylinders. If you google search this subject "site:supercub.org" you will find lots of opinion on no STC for the engine needed. You will need an STC for the airframe.
 
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