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

nm9stheham said

If you don't run down the machine shop and ask them then you may be missing the boat.... engine size by itself does not cause vibrations.

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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.