the thiteks are a great option and come with a decent port job standard. i run the 2.20 thiteks on my motor and they are fantastic. honestly though, intertias porter can get as much or more than the thiteks on a apache head. might be worth saving yourself a thousand bucks. the thiteks are 3499.00. either way is a great choice. do you already have apache cores?
I've got 6.1 cores. I figure as long as the short turn can take it, the throat can be resized to take advantage of a bigger valves. Not sure how much difference there is in the short turn area between each head.
