[DeTomaso] Brazing

[David Fisher]

Any of you craftsman  out there that can tell me why my brazing is
sometimes porous?  I am getting tiny little holes in the brass.

Too much heat, oxygen, not enough, etc?   Anyone found any good online
resources for this?

I know it's a bit of a lost art, but I find myself doing it occasionally on
my Jaguar as that was the factory practice.

Pic attached

http://www.poca.com/index.php/gallery/?g2_itemId=38384


Thanks

David