One method I saw on U-Tube was to bolt the block to the cross slide. You need to make up a boring bar with bushes on the ends, which fit the block. The boring bar is then driven, via two universal joints, by the chuck. It's not that difficult, because the holes in the block doesn't need to be at centre height. The saddle is then moved along to bore the holes.Line boring the main bearing caps has been at the limits of my equipment on hand. I first ball milled the three center bearing webs and caps with a one inch ball mill to a depth of .460. Then installed the caps and cobbled up a way to attach the block to a face plate on center. My plan is to line bore the three center webs with a boring bar that can reach the first two without any problems but the third one is out of reach. I planned on unbolting the block from the face plate and flipping it around to get the third one. But it took so much time and effort to get it all running true and centered that I would prefer not to do that again. So the setup will stay like it is in the picture until I either make a longer boring bar or come up with something else.
bruskiView attachment 117576