Originally Posted by piston slapper
I've sold and used a bunch of them....
The reason that they aren't popular is that most people don't have the correct tools or technical experience to properly assemble an engine...
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I was thinking more in line with wear or damage to the original crank and other components. Where buying new parts would exceed the cost of a short block. Unless it was a limited application. And you had no choice. But in your zeal to display your unparalleled skill and knowledge, you missed my point.