The itch has never gone away but that working career thing that gets in the way of playing is winding down. Pulled when I was young at the county fairs (usually the tractor with the best tires on it that year) or whatever Dad would let me use. Now I would like to build a reasonable antique pulling tractor. It will be a farmall H or M. What model will allow the most weight classes without abusing or breaking things up. Yea Ive seen some tractors weighted way passed safe limits to pull more classes. And another ? is the raw block sleeve bore the same on the supers as the regulars can't seem to find this info. Thanks ED