4.7 compared to 5.2

4.7 is an overhead cam motor, 5.2 is over head valve. i believe that the blocks are different so you cant switch heads or really much at all if i remember right. Ive got a 4.7 in my 2000 durango automatic, 120k miles and still runs like new. i raced a 98 ram 1500 318 5 speed. He couldnt keep up, but then hes got a little more weight, not that a durango is a whole lot lighter. both dependable motors, get about the same mpg