the valves only have a 50 or 60 runs since the last valve job and the timing chain is only one season old. when i last freshened this motor the rings were not changed only valves and bearings. I had pretty good luck with this motor, all I really need from it is a few more passes this season then it will get a new set of .030 pistons with .100 domes ( this is a claimer class after all). so if the bores don't have a stupid amount of taper what would you recommend for my new ring gap. thanks in advance.