Turbo6 posted some flow #'s for the Brazilian 12 port a while back. Like MDHD said, even when ported, they don't even really come close to what a siamese head will flow with the bolt-in lumps. The bolt-in lump heads are in the 240-ish CFM range. A Kirby/Sissell head and a fully ported siamese head have the capability to flow well over 300 CFM, so I would look at trying to copy a head like that as opposed to the Brazilian head. Even though, further porting and improvements could probably be made to the Brazilian head, I don't think it would be a good head to try to copy.
