OK so here is the deal. I am getting ready to screw a motor together. The block is new enough to be a roller block but it is still a motor that we would use in a HAMB friendly car. That was the back story. ^^^^^ Now the discussion came up about using roller lifters on a flat tappet cam. This was just a general discussion. Before someone gets all self righteous about this question bear in mind that roller cams have been around since gawd knows when. Anyway I am no expert on the subject and have not tried it yet (I have run roller moors since as long as i can remember). But my thoughts are that the cam shaft and the lifters will not care. I could be wrong. So what are your thoughts or better yet experience in this subject. Please play nice and don't fight. Remember drama is your enemy.