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

So you are saying a big engine won't vibrate a car that it would be like the honda my neighbor has on start up? I don't agree with this. Even stock 440 cars would shake at idle and vibrate the car.

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.