[Kenth]

All I'm saying is that modifying the flex plate and damper that were originally neutral means that they are no longer neutral and the whole point of neutral flex plates/flywheels and dampers is that they are replaceable if something happens to them. This doesn't work if they are modified. Therefore, weight adjustments during a balancing must be made on the crankshaft counterweights, regardless of whether you use an original flex plate or a neutral aftermarket flex plate. Drilling, cutting or welding the flex plate or damper afterwards is a sign that the balancing has failed.

FWIW

[P@blo]

Originally Posted by Kenth

No need for a second balancing, IF the flexplate and damper are truly neutral, which they should be.

If in doubt, check the flexplate and damper FIRST, to avoid headaches later.

I just had my 455 internally balanced and the machine shop asked for the neutral flexplate and balancer after to verify. As Kenth mentioned, modifying a neutral balancer or flexplate does not make sense.