Engine Carburetor Street Series Model 850 CFM Mechanical Secondaries Type ProformPROFORMs new Street Series Carburetors are hand assembled in the U. S. Based on the wildly successful Race Series carburetors the new PROFORM street carburetors. Constructed of light weight aluminum, changeable idle air bleeds for easy non permanent calibration changes if needed. Fine tuning is accomplished by simply changing air bleeds not opening calibration restrictions with a drill bit. Each street carburetor features a billet metering block with