Putting the alternator on can be done for any engine you are just using the existing 337 as a guideline any reasonable FAA inspector will sign it off as a field approval. I've gotten about 1000 accepted in the last 30 years and have virtually never not been able to get something approved one way or another. You just have to put it in a form they will easily accept. You are moving from the known to the unknown and need only put out a reasonable path for them to follow. In each office there are some that are easier to work with and some will like the coupe and some won't. Your mechanic can usually pick the right one of several to send the 337 form to as he is assigned to one principal inspector as an IA. If you don't like yours youi get another as we tend to have them for many years./thomas
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