1050 CFM Full Billet 4-Bbl Mechanical Sec 4500 Flange Race Bred Carburetor

Speedmaster 4500 Series carburetors feature an all-new CNC Machined die-cast aluminum main body, which has 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, providing smoother and more refined air entry, a stronger vacuum signal, less turbulence, and improved fuel emulsion for better combustion. 4500 series carburetors use red anodized billet aluminum CNC-machined metering blocks featuring 3-circuit metering (gasoline carburetors), changeable emulsion, idle feed, and intermediate bowl and feed discharge. The 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.

The 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), full progressive (50 percent), and 1:1All features result in improved throttle response and increased consistency are all part of the package. Whether you use a throttle stop or run heads-up this carburetor will help you get to the winner's circle. 1.710' venturi x 2.000' throttle bore Viton 0.130' Needles and Seats Billet Aluminum annular booster inserts Hand assembled and engine tested in USA.