27 With the 1-inch spacer declared the victor, we moved on to the final tune. A jet size of 84 all the way around kept the carb a bit on the fat side. For the final pull, we leaned the carb out by dropping to 82s all around. The results speak for themselves: max torque of 479.1 lb-ft and 458 horsepower. The A/F was still on target, so this is the combo we’ll keep from here on out.