They flow better than the stock factory head. I don't think that you will notice it. There is a drawback to the head if you try to go larger than a 1.92 valve. There just don't flow well into the combustion. I did this and although the flow #'s looked good the combustion efficiency went down. A MP factory pocket ported 596/2.02 head flows better and makes more power. I Super Stock ported a set of EQ heads with the 1.92 and they are impressive. You are talking about 5K of porting work.
