Need some help here guys, I'm in the process of rebuilding my baby: 1993 XR600R because I fried one of the cam lobes and corresponding rocker arm. So, here's the question, I got the new cam from the dealership, regular stock cam because that's what I assumed was in it. Now, I've compared the two side by side, new vs. old, and there is a big difference. The old one has lobes that appear almost rectangular, the lobe is almost as wide as the cam itself at its highest point. The new one has lobes that look like an egg. Can anybody shed any light this? Was the old one a aftermarket one? Is there anybody that could tell me what differences I'm going to experience with the new cam? Any information would be greatly appreciated.