I recently shot a rod through the block of my B18B and after being torn for quite sometime about the possibility of a swap into my car, obviously have to go big if spending the cash on a new engine, I have decide to build the #$@& out of a B18B and throw a wack load of boost at it. My question now pertains to boring and sleeving. I am interested in getting 84mm sleeves and was curious to hear if boring the cyclinders out for the sleeves causes any problems with the cylinder walls being too thin? Sorry for the noobish question but this is my first engine build and I haven't been able to find any information pertaining to the maximum bore capabilities while maintaining adequate cyclinder wall thickness or if the sleeves will take care of this issue altogether. Thanks.