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How much is Enough?

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cajunflyer

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I have a Lycoming IO-540-G1-D5 for my Skybolt project that has about 200 hours SMOH (1200 total), but has been sitting unused for something like 20 years. It has been stored in a low humidity area (New Mexico). It is on a stand, and turns easilyas I found out when I picked it up a year ago. In fact, it still has oil in it, as I alsofound out after turning it.My question is this - how much "overhaul" does it need before I consider using it? After reading and talking to others, I'm thinking about getting a professional to inspect it as if it has had a prop strike. Is this enough, or should I be thinking full overhaul, or something else entirely? I would like to avoid replacing parts just for the joy of replacing them, but I'd rather do that that than have my 'bolt turn into a sailplane because of something I could have avoided.
 

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