Is it?
An old, worn and clapped out engine would look exactly the same when painted all over. After the paint-dunk, one can't easily prove the engine has been apart anymore, or even at all.
That's the image I get when I see engines painted like someone poured a bucket of paint over it.
Nice example below, where I'm seeing telltale signs here that this engine has had a '$10 Spraycan-restoration' by the seller.
Clueless buyers who usually only look at paint, whether it are cars or engines, might fall for this and get taken badly;
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