What valve springs did you use with your Isky E-4?
Im not sure of the maker of mine to be honest,but i did check there spring psi @ the installed hight & @ the now .435 ish lift ( with the lash) & installed was 120 lbs & open was right @ 280 ish lbs. with plenty of room before coil bind. They looked new so i checked them & sure enoph good to go! singles with dampers. If i had to guess id say comp 901's.