Originally Posted by Storm Rider
The biggest difference between the 4.7 & 5.7 is that the 4.7 only has 8 spark plugs as the 5.7 has 16 spark plugs. The 4.7 is a very reliable engine and gets a little bit better mileage. I own a 5.9 and it is a monster. I have a heavy duty 4x4 so my mileage is terrible, but the 5.9 will never let you down.
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If it's one of the 2008 or newer 4.7's it will have 16 plugs too...they also got a HP boost from 230 to 290HP