I think the 50oz imbalance works great if you run a lightweight piston and rod combo. The further away from the crank centerline the weight is placed, the less overall weight you can run. Zero balancing often requires adding mallory to the crank, as Wade mentioned. This makes the whole rotating assembly heavier. In effect, if you were to take a 1 pound weight off of your flywheel, it may take 1 1/2 or 2 pounds on the crank to make up the difference.
IMO, having less weight is more important than where the weight is placed.
Andy
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88 coupe
91 LX NMRA Pure Street 5120
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