The ZR-1 had a problem with broken camshafts. They concluded that an employee at the factory figured out if he reeved them up in going from the factory to the storage lot they warmed up quicker.
They used to say never buy a car made on a monday or friday. I guess the new standard is never buy a car completed in the winter!
Not a mercy-dees fan, but this video of the construction of the AMG turbo engine (performed in their factory by individual constructors and then “run up” at the end of the video) was fascinating.
The preplaced template/modules of the elements of the build, along with the computerized torque of each part is part of the interest, and at the end the install of the twin turbochargers and the mechanical highly controlled run of the engine capped the entire build. A signed crafted engine by the builder. Each engine on precision mount on wheels, which rotates the block. Perhaps you might enjoy if have the time.
No “revving” by an employee possible that would not be part of quality control. It’s 18min 41 secs and has zero music, also!
https://www.youtube.com/watch?v=vx0UHvkR_qY