If the cylinder walls are quite thick the engine could be bored out to increase power. That would be a relatively inexpensive proposition compared to a revised crankshaft to increase the stroke which would require a much thicker wallet. You could also put higher compression pistons into the block which would further increase power. It goes without saying that your warranty would be worthless, however.Our 2.4l block has a very thick wall i have a youtube video laying around type in mrpocket1989 i took apart a theta 2 motor on my 2.4l
I can't imagine someone swapping back to the original engine to get warranty work done.As an aside, these engines should be readily available through dismantlers for a small price. They have warehouses of these and other make engines all over the country. I've seen them on ebay for some very reasonable prices if someone wanted to experiment with them. You could then stick the original engine back in it should you go to trade it or have warranty work done.
Perhaps, but when it comes time to sell it, it is best to be completely stock. I don't think the engine swap would be that difficult with an engine hoist if someone is reasonably mechanically inclined. I have pulled several engines in my youthful days. I even swapped in a V8 to replace a six cylinder engine which required welding in new motor mounts. It can be done.I can't imagine someone swapping back to the original engine to get warranty work done.