Randy I cant answer your question but I can show you my EZ head Dwayne did some of his magic on. These flowed 329 @ .600 I believe and I know my car has much more in it then the 11.0's I went last time out with problems. These were just opened up a tad as he did not go all out on them. His work is fantastic and you cant ask to deal with a nicer person. I dont think you will regret having Dwayne work them for you. Do have any port work at all done on your heads now ? Ron