These big block Century coil springs are a linear rate and provide great performance for street driving. With a 1" drop from stock height you can get that nose down attitude that you've always wanted. The spring rate is stiffer then stock and is an excellent street spring For road racing applications other springs area NOTE: these springs are meant for a standard big block with cast iron heads, If you have installed aluminum heads and reduced the amount of weight on the front end you might want to use small block springs.