At the time I ordered the heads I got caught up in flow numbers not realizing how important cross sectional area/port volume is in relation to cubic inches. I just didn't know. Now that I do I want to correct it. I've looked at the Trick Flow 190's but the port volume is only 190. I'd prefer 210-225. Indy's are out of the question at their $4400 "get in the door" price.