Trick Flow® by Quick Fuel Technology Race carburetors feature all-new die-cast aluminum main bodies, which have a lengthened venturi section for greater midrange torque and better airflow. The annular booster venturis are precision die-cast with CNC-machined billet aluminum inserts, for smoother and more refined air entry, stronger vacuum signal, less turbulence, and improved fuel emulsion, providing better combustion. Trick Flow® by Quick Fuel Technology Race carburetors use black anodized, billet aluminum CNC-machined metering blocks featuring 3-circuit metering, changeable emulsion, idle feed, and intermediate bowl and feed discharge. Their die-cast aluminum fuel bowl combines high strength with significant weight reduction. They feature dual threaded fuel inlets and outlets and dual sight glass holes to easily set the float levels. Trick Flow® by Quick Fuel Technology Race carburetors feature external linkage with four different links to select the amount of primary throttle opening before the secondaries open: moderate progressive (25 percent), medium progressive (40 percent), and full progressive (50 percent).