I've compiled the following information on SBC Cylinder heads to help compare them. For the flow remember bigger is not always best. Some of the heads with large flows and big runners are not going to be good street heads, since they will have slow flow through the runners at street rpm. Also if you have a cam with less than .500 inches of lift then the flows at .500 of an inch and above mean nothing to you. A lot of people recommend looking at the flows around .400 for a street motor as that is the lift you will see for a good part of the cam duration.
dette vil si at viss ikke kammen har mer enn 500 i löft så er det ikke vitsi og gå etter topper med mye flow over 0.500???