We ripped this chart off of TFS’ website. While it’s good to be skeptical of manufacturers’ numbers, based on our firsthand experience with Trick Flow’s heads, we have no reason to doubt them. If you can afford these heads, they are a great buy with the potential to make tons of power. On a lower budget? Look into Ford Racing’s M-6049SCJA Super Cobra Jet or Edelbrock’s 60669 Performer RPM heads.