THe 4.7 is a strong engine that still can get good MPG. However, I don't believe it is rated as HO.
I wouldn't recommend changing the engine. THere are many things you can get to increase HP. My only concern is if the trans will hold up for you.
Let me know if you have other questions.
SPONSORED LINKS
Thursday, March 25th, 2010 AT 8:57 PM