Had a conversation about this subject with a person that has done this process on a few engines. With a quick measurement of a handy block and general knowledge, a bore of 97mm should be possible. So, if I were to get that far, a 97mm bore with my 94mm crank would net a displacement of 2778cc. A 2.8 liter 22R, WOOOHOO!! The sleeves would have to be custom made Siamese wet sleeves, $$$$, the block basically gutted, cut the cylinders out completely and the proper base and top lands cut to accept the cylinders, $$$. Then the block would get decked and bored, $$. The suggestion of cementing the block for the bottom of the cylinder where no combustion heat is present for cylinder strengthening and added block rigidity, $. Off the top of the head guesstimation would be a few thousand. Definitely not worth it, but maayybee……. See how crazy I get about this idea.