can anyone out there tell me what a stock 1600 dual port head is cc'd about ? and any information on how much to cut out to get them around 50cc if there not already around that?

I think its around 53cc.

Depends on what heads? Brazil are dif from German and each manufacturer can range quite a bit
Have a look on samba,
http://www.thesamba.com/vw/forum/viewtopic.php?t=573099 


Its best if you CC them yourself