and Detroit Diesel. When GMC launched the Twin Six V12 in 1961, it wanted to prove that gas engines could stand up to diesel mills in the heavy-duty segment — and, in some ways, it did with its ...

When it comes to an engine that's built for sheer performance, we typically think of the V12, at least in modern times. Most high-end automakers feature, or have featured, V12s in their flagship ...