Doesn't sound right. The crank, rods, and pistons are already balanced to 50 oz. The balancer and flywheel are spec'd for 50 oz. imbalance. Replacing the flywheel should be fine, as long as you use a flywheel with the same imbalance as the old.
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Russ L
'91 LX - 331 w/ Procharger
'03 Cobra Convertible - Pullied
'94 Lightning
'65 Mustang Coupe
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