I finally dropped my '67 at the shop to have the final adjustments and inspections done so I can get it on the road. One of the things I asked them to check is the vibration I am getting from the motor at around 2000-2500 RPM. It happens when the car is in park as well as when it's being driven so I know it's not in the drivetrain. I thought maybe it was a timing/advance issue but now I don't think it is because it starts too easy and is way too smooth at idle speed. The mechanic thinks the motor is out of balance but it hasn't always had the vibration so I don't think it's internal. I know a bad harmonic balancer will also cause a vibration when the internal rubber goes bad. Has anybody had a similar experience? Does anyone know an easy way to tell if the damper is bad? It's one of the large 11 lb. hipo balancers.