also looks like the bottom of the rhs barrel has been machined??? just looks a bit fresh comp to the next one. poss machined to get rid of the poor tolerances between one barrel to the next. id measure. if there both bang on then they prob have been matched. the ears have been flowed as have the transfers by the look of it although the latter looks minimal. measure the ex port/have a look for signs of work to the ports. at least your ready to roll once again.
