John, High compression pistons are not available for these engines and milling the top of the block will increase compression. I'm well aware of rod stretch that's why I'm just wondering how much I can take off. Also I beleive that "align boring" is to make all the journals round not to "square the block". The top of the block is milled parallel to the crank centerline thus "squaring the block"
So each journal is differnt size, great, sounds like more money at the machine shop.
