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Re: Swapping a 2.8L with a 3.1L?
The 3.1 and 2.8 are the same engine except for the stroke on the 3.1 is longer. They changed the stroke for better balance to keep the lower end in them longer. All the sensors are the same in both engines. Even the fuel rails can be swaped between engines. I do not know if the heads can be or not. The only catch is that it has to be close to the same year, 88 to 91 otherwise you have to change motor mount points.
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