changed my views after reading an article that stated that any floor jack can experience a "catastrophic failure" at any time without warning! northern tools has a device that will hold the engine up once it is jacked into place. it sits on opposing fender wells with a chain that holds the engine up. far safer than risking your hands to a hydraulic floor jack. granted a lot of people have used floor jacks to change out engine mounts, but what if you are that one in a million that experiences a hydraulic jack failure while your hands are under a very heavy engine?