I have two sets of 5.7 heads 03 and 04 and both have the open chamber heads-not like the ones in your pic or the magazine article, the Eagles are the "late model" and "closed chamber" head unless you mill your own. That brings a couple question to my mind, how much can you safely mill the early heads? Can you mill them to closed? I guess you can if you had them in 06 Lastly I know the Eagle head is supposed to bump an early 5.7 close to 12 to one, are they just a bolt on or do they nee something changed to do that?

BTW The apatche head on the 392 is closed chamber and the 6.1 heads are open chamber.