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Thought I'd post as I've just tried the Centramatic product.
It's not on my c4, but on my 72 Camaro with the two-ton 'z28 mag' steel wheels (and oversize tires in back). I have a bubble balancer and couldn't eliminate the highway vibrations completely, though I was close. I just today mounted 4 of these balancing devices on it, and I am impressed. The Camaro is suddenly about as smooth on the highway as the Vette.
The Vette's wheels are so close to perfectly balanced I'm not sure I'll need 4 more, but I wouldn't hesitate to use them on it or anything else. I expected to be disappointed, but no way. They work great so far.
I suppose things like 'Rattler' harmonic balancers would be destroying motors if the method didn't work. Despite the cost I opted for these over beads, though I'm quite convinced now beads would work also.
I have been very impressed with the Centramatic product for years, applied to many trucks. I never got used to the sound of the beads rotating in the tube at the premeter of each disc as the wheels got up to speed but on a truck it wasn't a big deal. I eventually took the risk and found the dynabeads solved the balancing ills on the Vette. No vibrations at any speed I care to drive. Now the only road vibration I experience is from the poor quality rippled asphalt re-paving phenomenon in Southern NH. The rippled re-paving was so bad on Rte3
between Nashua and Manchester the State made the Contractor re-pave newly paved sections as it was driving people nuts! Thanks.