This is a excerpt from the spreadsheet I used to balance everything on the engine. AS you can see the difference in weight side to side was identical (Scale read to 0.1g) the difference from heaviest to lightest was only .4 grams. I think this was a pretty good result :) As a reference the Stock Rod, rod bolt, Piston, rings and wrist pin weighed in at approx 1146 grams vs the GT3 Rod, 105mm Piston rings and wrist pin came in at approx 1001 gams. A total saving in reciprocating mass of 872g