whats different about them from the ones in other vtec heads?

 

i believe the intake ones are the same and the exhaust ones are dual valve springs.. correct me if im wrong.. but im pretty sure thats wat it is

 

I read on here that the exhausts ones are the same as the GSR intake's (double spring) this implies that the intake side of the itr springs are different. but how so? how high does a stock itr rev? 8500?

 

im not to sure.. i have a p30 ecu in my car and i take it to 8k daily with stock valve springs and itr cams.. i do have a complete itr head here.. if i get bored later ill take it apart nd check the valve springs..