Not Ranked
The repalceable venturi for for serious tuning. You better have lots of experience, and a racetrack or dyno. They let you vary the CFM rating of each barrel on the carb. Honestly, most guys never get their carbs dialed in for their particular setup. Most people don't even re-jet them, or play with pump cams and squirters. Being able to tune CFM seems pretty unimportant given the tuning capabilities most owners refuse to use. The setup that works well for your combo, will work on the track and the street, unless you swap motors out between venues.
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