They need to used with the mono leaf they are designed for if you want to get the most out of them. If you are running an E or B body with a longer front segment that systems works well. A bodies with a good SS spring suspension, front and rear sorted out, work just as well. My Duster stocker has gone 1.36 60' with SS springs.
SS springs and Cal-tracs do NOT play well together! I tried it last Fall and it porpoised BADLY! I clamped the front and rear segments together as a stop gap solution and it calmed down but they really need split mono springs with the Cal-Trac bars.
I used the 3400 lbs. SS springs in my 3400 lbs. car and they worked well for about half a season. The made in Mexico springs tend to lose their arch, flatten out and wrap up on launch.
I need to get to the track with the whole setup but up to this point it's rained every weekend!
