What conversions have to be made when putting a 3.1 from a 1991 Chevy Camaro into a 1987 Chevy Camaro which originally had a 2.8?

Answer 1

I just did this exact swap with my firebird which of course is the same as a camaro.

If you are actually swapping the complete engine you will have to go around the engine and swap all the sensors from your 87 onto the 91 such as oil sending unit temp switches etc... or if you have the tools and know how you can rebuild the 2.8 with the rotating assembly from the 3.1 which is what i did. One problem i ran into is make sure you inspect the 3.1 block very carefully for cracks(especially under the heads on the block) because these blocks are very bad about the water jackets cracking. Unfortunately i learned this the hard way.