well i picked these up off a buddy on the other side of the country he is shipping them to me right now these are the specs i got for the
464- 64 mm inducer with a 75mm exhaust
471-71mm inducer with a 88mm exhaust
ill specs them out once i get them in hand i have photos of them also, have 2 471's if anyone wants to package deal, im keeping one for a sbc turbo build doesnt matter to me if its a 471 or 464