The PROFORM Black Street Series Carburetors include a Black Diamond coating for enhanced fuel cooling. Each carburetor is hand assembled and tested in the U.S.A. A ton of premium features are included with this ready-to-run carburetor like billet aluminum and cast aluminum components, fully adjustable air and fuel metering system, and refined tuning features that optimize fuel induction. Each street carburetor features billet metering blocks with a street performance calibration developed for todays high performance engines. Four corner idle is standard on these mechanical secondary carburetors, which helps fine tune the idle to aggressive camshaft profiles. Changeable idle feed restrictions expand the idle adjustment capabilities. Fine tuning is accomplished by simply changing air bleeds not opening calibration restrictions with a drill bit. Like all PROFORM carburetors, service parts are readily available however, should you not find PROFORM service parts, our carburetors are compatible with any modular carburetor service parts available at a local parts store or retail outlet. The billet throttle body for superior strength, coupled with precision throttle shafts to ensure long term performance. All PROFORM carburetors have easy access adjustable secondary air flow. Other carburetors may require special tools or removal of the carburetor to accomplish this simple adjustment. Complete with high quality, lightweight die-cast aluminum fuel bowls with fuel level windows for quick reference. Float level changes do not require removal of a sight plug with the risk of fuel spilling. Bowls come equipped with 3/8 inch inverted flare fuel inlet fittings and will accept all conventional dual feed fuel lines compatible with other four barrel carburetors. Sold Individually.