WHO'S GOT THE SCOOP ON RESIDUAL VALVES?

Thanks for the replies. The kits I used from Raybestos have springs that are tapered at the ends...Raybestos literature says the shape of the springs is to omit the metal expander rings. Since I used these kits with the tapered springs, I believe that I do not have to install a residual valve in the MC (that doesn't have one) correct?