Hey thanks for reminding me about eq heads. I am going to give them a call tomorrow and see if they can do something with a slightly larger chamber size. Mostly my issue with running a factory style vortec is the 64cc chamber size with cast iron. I need to lose some compression slightly, a 67cc should put me about 9.4:1, with the 64cc I would be around 9.62:1 which I was kind of wanting to lower a little bit with cast iron or either go to aluminum, I have actually been looking at the etecs too, I really like that head.