when I sent it , i marked the lifters and left them in place , in case they needed to grind the valves , etc , when head came back , marks had been cleaned off , and lifters in a sack . I checked with my mic , the distance from valve stem , to lifter seat , and they are different , my question is , will this be an accurrite way to determine , what lifter goes where ( they are guage stamped on underside of lifters , from 37 to 49 ) cause i really hate the thought , of best guessing , installing the cams , then when i start guaging them , finding out cams have to come back out to change around the lifter locations . HELP !!! ?