I have a set of version 4 STI heads that have just the springs. I am getting valves, but wondering what options I have for cams. Ive been researching and it sounds like the phase I heads cant use phase II cams....due to bearing differences right by the front seal. Ive been searching and I guess ive been looking in the wrong places since it thought the STI was a 2.5 for version 4 but all Ive been finding is Ej20t.. can someone please set me straight...I have never messed with turbo apps before and am stumped. Maybe Matt Monson or Jay Storm can comment if they stumble across this thread.