i ran my 59-235 on it breifly to check it out if it was worth while to put it in the truck the way it was. just to be sure i had my engine hoist attached to it just in case. it didnt move but then i didnt run it up in speed and just long enough to find out what i was wanting to see. it needed rebuilding and for that i made a test stand bigger and sturdier for that test firing and cam break in.