Proform 67255 - Engine Carburetor; Upgrade Series Model; 650 CFM Dual Inlet 4-Barrel w/Mechanical Secondaries; Square Type Bore Mount; Features Down-Leg Boosters and A Vibratory Tumble Finish; Includes Choke; Assembled With 100% New Components; Sold Each

PROFORM's new Aluminum Street Series Upgrade Carburetor is hand assembled in the U.S. Based on the wildly successful Billet Aluminum Street Series carburetors the new PROFORM Upgrade carburetors are constructed of lightweight aluminum including changeable idle air bleeds for easy non-permanent calibration changes if needed. Keep your drills in your tool box; fine tuning is accomplished by simply changing air bleeds not opening calibration restrictions with a drill bit. Each street carburetor features metering blocks with a street performance calibration that's ready to roll right out of the box, and developed for today's high performance engines. Four corner idle on mechanical secondary carburetors to help fine tune the idle with aggressive camshaft profiles. Changeable idle feed restrictions further expand the idle adjustment capabilities. Conventional service and tuning components are available in most performance retail outlets. The package is completed with high quality, light weight die-cast aluminum