I am currently running a set of Edelbrock RPM rectangular port aluminum heads on my 502's. I am very happy with them but I would like to know how much horse power they can support and what kind of work can be done to them to flow a little better? I did have them lightly messaged before they were installed and I also had them flowed. The builder cut them from 118cc down to 110cc to obtain 9.6 cr on my current set up. If Im reading this report right the heads flow 315 cfm on the intake and 223cfm on the exhaust at 650 lift at 28". and 318cfm intake and 230 exhaust at 700 lift.So my question really is can I use these to build these 502's into 540's and what would be the max HP with the way they are now?and max hp with more work if its even necessary?
Thanks Anthony

Friend built a 540 using the Edelbrock heads, Crane 741 cam 10:1 compression JimV re-worked the combustion chambers. 630HP on the dyno with accessories.

no body else???

These flow numbers are a lot less than the flow that JimV got with our Dart IE heads and also significantly less than the what some of the other brands of similar sized aluminum heads can provide. As you already own these heads, valves, etc, it appears there may 25-75 HP that the right head guy can obtain from these castings. The more CI the more air you will need. Once you know the heads flow potential, the best combination of cam, intake and exhaust can be selected to get the best performance. Mercury's 540 Bulldogs only made slightly more than 500 HP where others can get 700+ HP with 500 CI. The heads are key to easy HP. Jim V would be a great resource.

Jim touched up my AFR 335 cnc heads. Final numbers were 380 intake 290 exhaust at .600 lift. Your numbers are a little bit better than stock heads but there is a lot of room for improvement there. Jim knows what he's doing.

For what its worth, Jim did not encourage him to port the heads. For how much he would have invested into porting them the benefits did not out way the cost. I don't believe they flow as much air ported as an out of box Dart or AFR. He reworked the chambers to get the compression down.
Doesn't hurt to call him.
616 889 0928