Just wondering if the original flywheel might have had some holes drilled in it to "neutral balance" the flywheel, before they balanced the rotating assembly? Have you looked at it and compared to the second flywheel?
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs
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