So I just found out yesterday that my brand new AFR heads come from the factory with valve springs for use with a solid lifter roller cam. I was planning to use a hydraulic lifter roller cam in my new 408W motor. The cost to replace everything (springs, retainers, keepers and maybe the seals) for hydraulic roller cam use: $300-400 !! It had never occurred to me that I need to pay attention to the type of springs while selecting the heads. My choices as I see them are: keep the heads the way they are and go with a solid lifter roller cam or swap out the springs and go with the hydraulic roller cam as planned. Is a solid cam a poor idea for a street motor? I've always heard that and built race motors that way. One Mustang buddy of mine is running a solid cam in his 408W and he says he doesn't hardly mess with adjusting the valves. Im open to new ideas but I don't want a maintenance intense valve train like days of old.