head bolt bulge in runner?

I really want to learn how to do head work to make them flow better. I found this and fortunately they are using small block Mopar cylinder heads so I can try to match the picture to the head I'm working on.


http://www.popularhotrodding.com/en...dcore/0602em_cylinder_head_porting/index.html


I have some old heads I would work on first and see if I can the flow numbers up on them. I'm serious about this now and try to take my time and learn how.