I agree with (excelerater) these heads are o'k for steet use but for an all out race engine they won't handle it.
I can't tell if they are ported or not from the pics., but i can tell you that they are the same casting as sold by Pro-Comp. Electronics (and i am a pro-Comp dealer). I donot advertise and donot sell on RJ or Ebay. i have sold both B/Blk and S/blk heads and looked them over pretty good. the major fallback is the deck thickness is only 3/8" thk. and will not handle nitrous or a blower application without blowing head gaskets. I can build the same set of heads for under $1,100.00 in parts and under $750.00 for a S/blk.
If you are talking about serious racing, you need to go with a better casting with a thicker deck, most other heads have a 3/4" thk. deck such as AFR, Dart, or Brodix.
Like i said i sell them to street people but donot run them, i'm a brodix person.
Just my .02.
Zip.