Miniature Ford 300 inline 6-cylinder engine, by gbritnell. The builder estimates this is around 1/7th scale.
No CNC used; the builder specifies:
"I was trained as a metal patternmaker and learned to machine all types of shapes so today with the help of my Autocad program I draw the contours that I want and give them numerical points to machine to. Kind of like CNC but by hand."