Hey so I was wondering if say the blocks for the 40, 42, and 46CI blocks are all the same. I am asking because I have a 42CI 18HP opposed twin with a wrecked block, and a 40CI 16HP opposed twin thats all good, so I was wondering if I could swap the crank and rods from the 18HP and put them into the 16HP without having to mill the pistons?