When my head was off when I did my 30 bottom end I hacked off those lumps. I would certainly not call it porting. I know enough about porting to know I can't do it! I had previously hacked the lumps off inside the exhaust manifold.
No back to back comparison for the "lump hack?" power gain,as i dropped a 30 under it at the same time, but I have noticed I sleep easier not worrying about different size lumps in my exhaust ports