Quick Fuel Street-Q Series Carburetors are designed for street/strip use and will provide you with unmatched performance, at a reduced price. The difference between Street-Q and Race-Q series carburetors is the use of die-cast aluminum metering blocks and throttle body, rather than fully-machined billet aluminum components. All of the critical functionality is retained, including two-circuit metering, downleg boosters, and a four-corner idle system. Street-Q carburetors are available in both mechanical and vacuum secondary adjustment models.