I got my ISKY part #9365 plus series valve springs yesturday and after some carefull measuring they come in at 265 seat and 600+ open pressures. My concern is about liveable pressures on the street and how much is too much in terms of my Harland-sharp rockers and shafts. We also removed the inner spring on the new ones and replaced it w/my old inners and the pressure dropped to 230 seat and about 580 open so, which would you run? My old #`s were 200-210 seat and 525 open but my car seemed to level out on the second half of the track which is why I`m changing em out.....much appreciated.