Wrong. If you look into the intake ports of a 906, they are obviously different than a 452. The guide boss and the shortside are quite a bit different. Compare the two side by side and it is very clear. As far as what's better, it depends. In stock form the 906 is a little better. http://www.hotrod.com/how-to/engine/5115-cylinder-heads/ http://www.moparts.org/Tech/Archive/bb/62.html
