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I have an 83 motor in my 87. Direct bolt in EXCEPT.
1. There are changes to the power steering pump mounting brackets spacers.
2. The temp sensor for the gauge is different DME temp sensor is the same.
3. I think there was a difference with the speed and ref sensor mounts as well but either will work with either motor. (I am not 100% on this one)
The good? The 83 motor has forged rods.
When I was racing years back we actually prefer the 83 short block. We then used an 89 head and cam. Skim the head and you have your compression back very close to the post 85.5 motors. Some minor work to the intake and exhaust ports was the final piece of the build.
The whole DME AFM thing is only if you are swapping the electrics around. You can not mix and match early and late with each other. IF you are doing a strait motor swap dont worry about it just use what came with the car with want ever 8V 2.5l motor you plug in.
BUT as others have said fixing your motor is a much better option unless there is fatal damage to pistons or the cylinder walls. does not usually happen unless you broke or dropped a valve.
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