You would have to move the oil pick-up diagonally up and to the outside as far as possible. That combined with the honda rod journels I believe will get you a 4.5 stroke. These people should be able to provide the block. http://www.speedomotive.com/ps-615-74-speed-o-motive-uber-block-assembled-custom-short-block.aspx Presto chango 572 4.5 x 4.5 Thats if I am spending your money. On my dime 523.