oooops on Piston choice

what did the stock pistons weigh? was it rebalanced for the .120" down pistons and what did they weigh? I agree with Smokey and Ed Hamburger - swapping pistons within 10% weight - and below 6500 rpm can be fine without rebalance. what numbers are on .120" pistons? stock 440 pistons weighed from 820 grams to 870