Look at it this way. You probably aren't going to go fast enough to need anything more then a flat tappet cam. Plenty of 8 and 9 second cars running flat tappets. I like the rollers as well, but look at the cost difference. Unless you're trying to run way in the 8s, or just anal about having a roller those would be the only reasons I could see why to have one... I really wanted to run a roller in my motor, but at least for now due to cost I am going flat tappet.