I forgot to mention it, I hope you've got some serious gear in that rear if you're running that cam with 31" tires. Tall tires (numerically) lower your gear ratio, thereby decreasing the torque multiplication. This will cause your engine to bogg down if you have anything less than a 3.55 or numerically lower. You either need to have a slightly higher than stock torque converter, or a manual transmission, and I'd recommend a 3.73 rear ratio, but more gear will work better. Reason I say that is the 264 is a good bit of duration, so it'll be happier revving up a bit more than stock. Hopefully, I'm wrong, I've used the Xtreme Energy cams, and they do defy logic and math by pulling much harder than stock at low RPMs, but 264 is still a good bit of duration. TK