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Discussion Starter · #1 ·
3.9 2004, do you guys really know any way to add horsepower to the 3.9 can’t find a lot of part or aftermarket parts at that.

have also been looking at engine swaps, swap a 4.6 and build the engine (would the v6 4r70w fit the 4.6?)

or a first gen 5.3 with a 4l60e, what would be needed for this swap?

any other swaps you guys can think of or recommend?
 

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