671 Blower ?

[Taylorman]

Im looking at a blower intake. The guy says it fits a 671 blower. Are all 671 GMC blowers the same bolt pattern no matter the manufacturer?

[TIMINATOR]

Yes, but on the bigger blowers the center under the rotors is cut out longer, as in when you get a base gasket it is usually universal and you need to cut it bigger(longer) for a bigger blower. The bolt pattern is the same. TIMINATOR

[kaqster]

You can have The Blower shop or some such Supercharger outfit machine the manifold to Blower sealing surface for an "O Ring" and forget about cutting gaskets also for a small fee.