I did the same thing with my cam. It was a 460 with a bigger lift and it was a comp cam. But it was my fault in the end. You see ford has this thing that if you install a bigger cam in the engine you need to shim the rockers up. Because on a stock 460 all you have to do is tighten them down and your good to go. Not on a bigger cam you will eat the cam up and that is what I did silly silly me Damn ford.