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This is highly unusual. Every used engine has "40-70k" miles though 
The only thing that I can think of is bad lifters, bad camshaft, or poor oil lubrication. With flat tappet lifters you're supposed to break them in by (after engine oil pressure and idle has stabilized) holding engine rpm around 2000-2500 in neutral. This lets oil pressure build up and splash around. However, I don't believe that it would result in failure 10,000 miles later. If it was the wrong camshaft and "e m i a t a" lifters I'm not surprised if they failed since I believe he sells junk.
The only thing that I can think of is bad lifters, bad camshaft, or poor oil lubrication. With flat tappet lifters you're supposed to break them in by (after engine oil pressure and idle has stabilized) holding engine rpm around 2000-2500 in neutral. This lets oil pressure build up and splash around. However, I don't believe that it would result in failure 10,000 miles later. If it was the wrong camshaft and "e m i a t a" lifters I'm not surprised if they failed since I believe he sells junk.
