No expert but I had Isky grind me a solid roller for my junk that most said wouldn`t work but seems to be doin just fine and from recommendations on here I even called Bullet to see if they could make a better cam that won`t eat springs and be streetable and they said no. I usually like more duration than most which may help w/traction in some cases but pulls like a freight train up top. Don`t know what my heads flow and don`t care but as stated above there`s a bit of math and science involved but I sucked in both of those classes so I just WING IT.............