Cadillac has never been shy about chasing excess, but one of its boldest engines never made it to the showroom. In the 1960s the brand developed an overhead cam V12 so large and complex that it ...

Every high-performance engine sings its own song, whether it's the penetrating wail of a turbocharged inline four, the aggressive growl of a V6, or the bone-rattling rumble of a big-block V8. But one ...