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A quick search for the bore and stroke shows that they both have a 78mm stroke and the bore is 93mm in the 3.2 vs 96mm in the 3.4. That suggests to me that you'll need the pistons from a 3.4, but the rods and crank are probably compatible. The mating surface on the head of 2.7L and 3.2L engines I've seen is flat with a recess for the valves, so if the bolt holes and passages all align I'd expect that you can bolt a 3.2L head on a 3.4L engine and have it work. Next, I'd look at the valves, expecting the 3.4L engine to have larger valves for better flow.
I may take some more time looking at it late tonight. Not planning to do it, but curious.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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