I am finshing up a 572 pump gas motor for my street car and I need to know how bad I screwed up. Here's the story. My pushrods cam in yesterday to I went out to install them and adjust the valves. I dropped the hyd roller Lunati/Morel lifters(I have the mid range lifters with the fully exposed rollers) and put the pushrods in and started adjusting the valves in the firing order. I got the last cylinder which is #2 and I noticed that the lifter did not look right. I looked closely and I realized the lifters were in backwards which I did not even know was possible. The lifters were turned ~45 degress so the roller was not straight and it make a mark on the cam on both lobes for #2. The engine made two complete revolutions by hand while setting the other valves. I can feel the marks with my fingernail but the edges are not sharp since they were made with the roller itself. The mark is only on the top of the lobes and half way down to the sides. I do not want to take any chances so I would lilke to know if the cam needs to be replaced.