Ive had this stuff already and its pro series your stuff was tuner series no matter what the papper work says. My pro 3s would coil bind if i used the springs from you but they are skunk dony get me wrong . Honestly the only difference i could see in the valves was yours was coated all the way mine wasnt meaning mine was the newer style but same thing no difference but the look. Im going to put that stuff in the head that were taking off my dads motor and keep it for a back up i guess since i have no use for it lol. I bought a head from a guy on here about a year ago with all this stuff in it . Yes i have to much shit but when i start racing it will be good to have back ups lol. When its all said and done id like to use this stuff with my pro 1s in a 250hp motor for my dd and build another car for the big motor but for now the big motor will be rocked in the heavy ass ek and ill enjoy every minute of it.