Oh crap..... Internally balanced engine with an external balance flex plate?!

Yeah we are. My 500ci Viper Truck idles just like our 06 Charger. Now my 96ci Harley vibrates constantly. The size (externally or internally) of the motor has NOTHING to do with the vibrations.

Your srt 10 truck is fuel injected and made to run at a lower rpm. Do a 512 stroked 440 with 2inch headers and 3inch exhaust and tell me it doesn't feel like your Harley, oh yeah plus the car has poly engine mounts and transmission mount with a torque strap and weighs 2800 pounds, no interior, roll cage and frame connectors. If you're telling me it's suppose to run like a new car. Thanks for your help.