No where that I seen did he mention what size engine he has. If he had said he pulled #5 lifter he could have been working on a 6 cyl. Of all the engines I've put together only one has been a roller. I have never had a cam go bad. I may be wrong but I even put a F/T in my bbc. Why recommend a roller when we don't even know what engine or how its used LOTS of differance in price here. JUST SAYING