I was asking because these RPM's i speak of are a used set at a really good price and ready to bolt on and go..Thats the only reason i was looking at these open chambered heads. I guess i will wait and get closed chambers when i can afford it. Whenever i DO get to buy a set, the only thing i will have done to them for a while will be to have them checked by a machine shop before installing them...no port work or anything for a while, so THATS why i want the best bang for the buck when it comes to choosing an aluminum head.. It would be different if i could buy new heads AND have them ported and all right at the start, but it would be a good while after buying them that i would be able to port them, so again, whichever head i buy, i want it to be the best one to bolt on as they come, besides being checked out. So, with my combo, what head would be the 'ONE'? I want something that doesnt need different rocker arms or this and that..