Sorry dumb magnum question.

you should be able to turn it, but you will have some resistance. i dont know what car you have, but in my 72 dart, the fan was about an inch and a half from the radiator and would'nt pick up enough heat to engage. i found a clutch for a late model 4.7 and put my ram fan on. put it about 3/4 inch from the rad. also, if you use a stock shroud, you will have to trim down the fan. dave.