Cam specs are 512/520. I bought the cam first and was only going to cam it but found some rockers and liked the idea of the roller tip and being a little lighter.My intentions where to build a mild engine that would not have reliability issues.I knew the rockers would likely need bigger springs but it sounds like more trouble than what its worth right? Should I just trade the 1.8 rockers for 1.6 or what would you do?Bill I just couldn't find any good spring info on here nothing more lol but I will say there is a hell of a lot of information and knowledge here if you can get them to share it lol