Bought these used from SonicBlue03L in a package deal with some stage 2 cams. Going a different route and bought a set of heads with valves and springs, so i wont be needing them. Was told they have 1500-2000 miles on them and I see no reason to believe otherwise. Part number 84706 From DRI's site Kit Includes: 16 High Pressure Valve Springs 16 Steel Retainers .620 Maximum Lift http://www.crower.com/valve-springs-4-6-ford-premium-ovate-conical-single-spring-747.html $200 shipped