Edelbrock casts them and machines them, this head has been around for 2-3 years,,,, I've probably ported 20 sets of them for bracket guys,, what's the big deal? They carry a 60lb penalty in ah,, 80-100 in other classes,,, only benefit is if you break a valve you can fix the head easily,, but you have to make 20 more hp to make up the weight....
