Holy grail of gasser parts , how many 671 blowers out of Ohio Georges shop you think are still around ? This one (George doesn't remember who) belonged to one of the S&S race team cars . Real deal , bought from guy who bought it out of Georges shop . I ran it about 20 miles on my blown Willys gasser , there were some scratchs on the rotors when it got it in the wrapper so is what it is End plates are magnesium George produced , blower housing is aluminum