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Based on my response to your earlier post, I assume you've done a "Search" on this subject and already have some data. Today, the recommended 1500 hours between overhauls is seldom followed by general-aviation owners (I believe that commercial operators like airlines and flight schools must abide by it, however). Engines that are well taken care of (flown often, frequent oil changes, not overstressed) typically last beyond TBO, often well beyond TBO. So an engine which is showing strong compression, has normal oil consumption and whose oil chemical analysis (done at least every other oil change) is still sound, is typically allowed to continue to operate.
On costs, I had one engine overhauled by a local builder about 5 years ago for $6,000 ($7,500 because it needed a VAR crankshaft). This was just for the bare engine (not accessories) but even then, this was the lowest I have ever heard. The numbers I hear now for a complete engine (with accessories, but not including a new crank) are around $15,000. Others with better figures may wish to add their views, since mine are not based on first-hand info.
Unlike helicopters, 3-blade props -- especially composites -- can lead to both performance and noise advantages. But they are a modification that requires an STC and can be costly if your props are fine (if they are not and you can't find a used blade, then it may be a cost-effective change).
Ernie
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