Share 'Best way to prevent the engine block from vibrating'

I have a friend who has replaced the engine with a new one. The engine has been shaking since. He has replaced the engine mounts and new brackets, but that seems not to work. Given that the engine runs, and vibrations do occur, the person is out of options. During the engine replacement the mounts and brackets were replaced and refrabricated to compensate for any difference, but still the vibrati…