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Hello, I have a 2006 Durango with the 4.7L Engine and I wanted to know if anyone has ever swapped or upgraded to a larger engine or even made cam/ crank/piston changes. What problems did you encounter? If you only made internal changes to improve low end torque would you need to change the computer or sensors? Any positive feedback would be greatly appreciated. Thanks
 

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I'm looking for the same. I'm going to do something and i'm debating about a 440 or dropping in my big cam'd 426. Doesn't sound like many folks have made the change.

 
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