I know its absolutely nuts but I read a posting this weekend where someone claimed to get 409 pistons in a 348 block. I mentioned that was probably a bad idea and to just put a bigger crank in. It did lead me to thinking about the future when 409 blocks are already in the $2500-4000 range and getting harder to find. THE QUESTION IS: #1. Can a 348 get 409 size sleeves in it and accomplish more cubes? #2. If it can be sleeved to 409 size bore then can it also be stroked out as well to reach the 470's-480 cubic inches? As the actual 409 blocks become more scarce and people want more cubes. Can I take a cheap and plentiful 348 block and install sleeves (not cheap) to get the desired larger cylinder bore of a 409 and then stroke that to get 470ci+ out of a cheap block? Has anyone done it? I'm not worried or thinking about the notches in the block because sleeves would take those out anyway. Anyone have pictures of their blocks before and after sleeves 348 or 409 from above and below? I have 2 348 blocks that are perfect externally but need 2 sleeves each, just pondering.