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The guys that built this engine are operating at the highest level in the sport. They would most certainly weigh and measure EVERY item that went into one of their motors. (They don't cost $150,000 for the best motors for nothing). If they accidently installed the 'light' part there HAD to be a vibration, however small, inside the engine. They most certainly would have picked this up on the DYNO i would think when they 'listened' to the engine. Again, these guys are the most highly skilled guys in the business. They could pick this up like you and i would hear a car 'skip'.
So, it was either a HUGE error which got overlooked at several points along the build process, or....
There was some attempt, for whatever reason, to run this underweight part. They have their reasons, and ideas, about the advantage which this might have created, either now, or down the road when they attempted something else. Heck, there might have been something else on this car that is now overlooked because so much attention is focused on a single connecting rod.