drop spring rate

[70camaro406]

Scott, this is a great tech article I found about coil springs...

http://www.afcoracing.com/tech_pages/spring.shtml



I've been debating whether to use traditional coil springs or coilovers myself. What I found is that you can't compare a 600 lb traditional coil spring to a 600 lb coilover. From what I've read, they are rated differently. So what you've been told from the manufacturers is probably spot on, 600 coil is pretty equal to a 450 lb coilover. Plus, since you have an all aluminum engine (LS?) you don't want to go too stiff. Like others have said, and what I've heard from the pros, you should use a softer spring, but go heavy on the sway bar and use good shocks. I would also call multiple spring companies and compare all the results. That's what I did when I bought my last cam, and it turned out they all recommended similar sizes. The same might just be true for the springs.