Ok, pulled the "Turbo cams" out of my ZC a while ago.. The seller never said what type of cams they are. They are regrinds for certain, and the only non OEM markings I can find on them is: "SD" Hand punched between cylinders 1&2 on both cams In yellow paint pen, on the gear side, they have "561I" on the intake cam, and "561E" on the exhaust cam. There is a blue band painted around the center of both camshafts. Anyone have any idea? Trying to identify them.