Can anyone explain to me why lycoming connecting rods are supposed to be installed so the rod identification number is facing downwards towards the sump at all times? The rods are symmetrical so why does it matter? I?m assembling my engine and realized that two of them were backwards when I was dropping the crank into the case. I?m guessing I can?t reuse the connecting rod bolts and nuts and need to buy new ones since they have already been torqued once?