07] While at the track, we jetted the carburetor in our test car down from 80’s in the front (with a 6.5 power valve) and 88’s in the rear, to 76’s in the front and 84’s in the rear. This leaned our A/F readings to an average of 13.0:1. It also slowed the car down to the tune of 12.47 at 107.59 mph. We decided to go back up on our jetting, so we installed 78 jets in the front and 86’s in the rear. This brought our average A/F reading to 12.4:1.