Econo Beehive valve spring kit. .585" lift

Steel top collars. Installed pressure 183lbs@1.760", open pressure & height 380lbs@1.250", coil bind@1.180". Direct replacement, installs without machining or rocker box clearancing. High tensile chrome silicone wire with a shot-peened heat treatment and a super NexTex® finish. Kits include springs, lower & upper collars, shims, keys and Viton® seals. Compatible with stock 5/16" (7.94mm) diameter valve stems.