When cars come through and I have to do work on the engines the worst ones almost always are the ones that people have "rebuilt" or have had "new parts" put in. This includes engines with new steel cranks and rods. Very rarely have I seen a decent rebuild. If the owner or a prior owner did any work to the bottom end or a machine shop didn't properly set it up from the beginning it's never a good thing. Most people don't have the tools or know how to handle engine clearances and assembly. There a huge difference between a properly specified and assembled engine and a rebuild. Also cleanliness during assembly is about impossible to achieve at the level the factory did while the stock engine was assembled. I've seen debris behind bearing inserts, rtv everywhere and i mean everywhere including successfully blocking the oil feed to rod bearings, old bearing inserts dropped into the engine and not removed before bolting it together, Plenty of very high mile original engines around. Lots of low mile/use crap in these cars that are a grenade with the pin pulled.
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