I fail to see how a 522 gram rod instead of 525 grams would be any performance advantage. Even if all 8 were 522 grams, a performance advantage would be a stretch. I am curious what the rest of the rods did weigh. I would guess 525 plus 1 for good measure. I know mine would.
How could the person in charge of engine balance not catch that. He may be a greeter at Wall-Mart by now