The 5.9 Magnum in my '98 2500 died and is locked up. (I assume it threw a rod) I'm hoping that in the spring, I will get some time to pull the engine and see what happened to it. I've never done a full engine rebuild but would love to use this as a low-stress way to try doing it. From what I have seen online and at local parts stores, I can get a rebuild kit (pistons, gaskets, rings, bearings, etc.) for $400-ish. There are probably another $500-ish of parts that may/may not need replacement (Cams, heads, crankshaft, etc.) No idea what machining will be needed, but I'm guessing $3-400. After I finish it and test it, I'll be selling it. My motivation here is NOT profit, but to learn about the process. I'd like to make the end-product a quality deal for whoever buys it and be able to sell it for a bit more than the parts I'll be putting into it. 1) When I tear it down and find out what broke, are there things that should scream "This engine is not rebuildable!" 2) If I keep it stock, what would a reasonable price for it to sell quickly? I see tired, high-mileage used (non-rebuilt) ones are $800ish on E-bay. 3) Are there upgrades I should do to it (that would likely make my money back) to make a buyer happier? 4) What level of performance should I target if I want a reasonably quick sale? Stock? Mild performance mods? I know that realistically, people interested in huge performance don't drive trucks with old 360 Magnum engines in them. But would they want (and be willing to pay for) something with better towing grunt?