All cams are ground for straight up installation. You change the mfr's. recommendation because you want to capitalize on something like better low end torque or more high end power. Any time you have a question like the one you just asked, go straight to the manufacturer's help line and ask. Its free and they know the answers. Good luck and use lots of assembly lube and be sure to follow the mfr's break-in advice. Cams are not pressure oiled at the lobe, so the worst thing you can do is to idle it during the first few minutes of running. They would get hot, ruin the cam and ruin the lifters.