My sister totaled her '95 Beretta Z26 a few weeks ago and my dad bought the car back from the insurance company for $200. This leaves a 3100 lying around available for me to purchase for a VERY reasonable price. I'm not sure of the miles on the engine because it was replaced shortly before we bought the car with 75k on it, but the car only has 95k on it, so I would imagine the engine has significantly less. Anyways, the engine runs very good and is in very good shape, so it is perfect for a donor engine. So I know people swap the topend of 3100's onto their 3.1's and it is supposed to give a pretty big power gain, especially on the Turbo engines.
I am interested in doing this to my STE, and want to know what all work is involved in doing this. I was thinking I would swap the heads, lower & upper intake manifolds, and throttle body, but if I remember from what I have been told in the past, going as far as the heads is difficult because of the different shape of exhaust ports and because the 3100 is roller and the 3.1 is flat tappet. So, is it possible to just swap the intake manifolds & throttle body? If so, how much work is involved in that, and what kind of power gain should I expect. If I end up swapping the heads also what kind of power gain should I expect with that and what exactly will I need to do?
Any suggestions would be very helpful.