You port a lot of heads. Some of the castings from China are better than others and can be more extensively modified to make more power. The Bloomer heads on my engine make an honest 680hp. But according to Rod my heads only flow about 296 cfm on the intake. Hopefully the Engine pro heads are castings that cnc programs like Rods and others can be used on them. BTW I've heard that a couple of companies are thinking about casting SBM engine blocks. My fingers are crossed.
