Whitedog think of this. The absolute baddest sixes in the 50's where the Hudson hornet 308 straight six. Contrary to an earlier comment. The development of this six was The combination of the Hudson and Nash engineers AKA the Kenosha boys. They Wanted to design a modern straight 6 to replace the older flathead sixes of Nash and Hudson. The AMC rambler was the intended use. I don't think anyone would be upset if a Chevy or Jimmy got an example of their efforts. It's truly a great line of engines. The only straight six of American heritage that Survived into this century. Survived 3 corporate owners. And is as common as air. Development started in 1961. First was used in the 64 Rambler. And last rolled off the line in 2007. Pretty close to the small block chevies run in terms of years.