Because "overhaul" can mean just about anything, it's impossible to answer. It all depends what needs to be done. In some cases, overhaul means inspect and replace as necessary, and in others, it's going to be a lot of replacing regardless of what needs to be done. Frequently, very little gets done if things are still in spec.
What would replace this powerplant? Just about anything would be an improvement.
I could not find any STCs for converting the Twin Commanders with GO-480s to anything else. I also did not see any STCs converting the Beech 50s or the Helios to anything else...
I can't think of any other major models that use GO-480s...
What kind of plane are you asking about? There may be an STC to replace it.
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