Well gosh, people....I have never heard the term "turn-key" used in any
other way than as described...."Turn the key" and use the device, the
house, the car, whatever.  "Turn Key" means ready to roll....

    I have never heard the term used to refer to a complete engine package
that still is in a box, those are called Crate motors, or something else,
but not Turn Key.

  When we builders finish a house, we hand the proud  the key we used for
the last weeks and we leave the extra keys hanging inside the front door on
a finish nail placed so the hole it leaves won't show....They walk right in
and find a cold six pack in the reefer and flowers on the kitchen
table....TP in the bathroom....ready to roll.....

   If someone offered me a "turn-key" Bostig  Westie or Syncro...I'd show
up with the cash and expect to drive off in it....I certainly wouldn't show
up with my tools or a car hauler and expect to put a couple of days
installing a motor before I could turn the key...
  Don Hanson