Thanks for the update. I’m also trying to understand the whole thing. I’ve always run my gto with the original m21 trans and flywheel and centerforce clutch but last summer installed a tkx..new billet McLeod FW,, PP and disc. The engine had been rebuilt and balanced with the oem FW. The spun balanced the oem flywheel and tried to match the balance of the new billet to the oem which the added a screw on small aluminum weight. Now the car had a small but noticeable vibration. I removed the weight and it seemed better. As soon as I can drive it again I will add the screws that held the weight on and see how that feels. Not very scientific if you ask me. I wish I had added a new neutral balanced FW back in the day and had them neutral balance the motor
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007
(cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD
1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.45 @ 88.1 mph on slippery street tires.Bad 2.19 60ft.Owned since 86'
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