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what would be illegal about putting a 5.2 in a my dakota
Nothing, if you use the right engine and retain the proper emission control equipment.
If you don't have to worry about testing, you can get away with using any engine. If you do get tested, you need to check the regulations in your state (probably needs to be the same year engine or newer, and keep all the goodies that were originally on the engine, but you'd have to check to be sure).
so with testing i sense i got the 3.9 and the wiring harnesses are different and i didnt put a new wiring harness in and just added to more things for the cylinders i couldnt get away with that if i wanted to
so with testing i sense i got the 3.9 and the wiring harnesses are different and i didnt put a new wiring harness in and just added to more things for the cylinders i couldnt get away with that if i wanted to
You would probably be fine with a modified harness, as long as everything works the way it's supposed to. The best thing would be to find a donor truck the same year as yours with a 5.2 and switch everything over, but finding one might be easier said than done.