This next video comes courtesy of AutomotiveTv and Ferrari, who decided to explain the sophisticated work of building the V12 engine powering the Ferrari 612 Scaglietti, which as you might now has reached the end of production.
The process of building the Ferrari V12 engine starts with the meticulous work or casting the main parts, with the results carefully inspected in an uncontaminated environment and then sent to the assembly.
The assembly of a Ferrari V12 engine is controlled by a single technician, with each stage being certified and documented, while perfection for the final result is verified on the test bench.  
Watch the building process of a Ferrari V12 engine in the video below the jump.

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Video: Ferrari V12 Engine Building Process

Source: AutomotiveTv via YouTube