680 CFM - Vacuum Secondaries - Black - Gasoline - Electric Choke. Splitting the difference between 650 and 700-ish airflow, the 680 CFM Brawler Street is a sweet spot for responsive street cars that need a little more headroom. Vacuum secondaries smooth the transition into the back barrels, keeping drivability civilized while still delivering a noticeable top-end bump. Black billet metering blocks and throttle body provide durability, the electric choke simplifies start-ups, and the calibration is set up for today’s fuels with easy adjustability baked in.. This model of carburetor has the square bore flange bolt pattern. It can replace Holley, Edelbrock, Carter AFB, and Autolite style carburetors with 5 3/16" x 5 5/8" bolt pattern. If you have a spreadbore style intake manifold, you will.
