Dyno Tuning Basics - Jets, Timing, Camera, Action
After the initial pulls, since the car was running so rich, the tuning team decided to first work on the secondaries of the carburetor and make a big change. Marty Parker jumped in and efficiently removed the rear bowl and replaced the No. 92 jets with No. 89s (three sizes smaller). After pulling the car again, the air/fuel ratio improved to 10.5:1, and with it both horsepower (375.2) and torque (430.7 lb-ft) improved by 20.3 and 2.7, respectively.
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