Carburetor, Holley, 650 CFM, Ultra Double Pumper, Mechanical Secondaries

Universal 650-CFM Ultra Double Pumper Carburetor (Mechanical Secondaries) by Holley®

650-CFM four-barrel with mechanical secondaries, lightweight aluminum body and adjustable fuel bowls.

This Holley® Ultra Double Pumper four-barrel carburetor supplies 650 CFM for compatible gasoline street/strip engine combinations. The aluminum main body reduces weight compared with traditional castings, while externally accessible fuel-bowl sight windows make float-level inspection easier. Its mechanical secondaries are mechanically linked to the throttle and use accelerator-pump enrichment for immediate transition under load. Metering-block and base-plate finishes depend on the selected variant and should be matched to the exact selected finish rather than assumed from another carburetor model. Confirm square-bore mounting, air-cleaner clearance, linkage and emissions suitability for the vehicle. Four-corner idle adjustment and the original-style dual-feed fuel bowls support engine-specific idle and mixture tuning.

• 650 CFM Ultra Double Pumper four-barrel • Mechanical secondaries • Aluminum carburetor main body • Fuel-bowl sight windows • Finish/anodized metering-block options vary by SKU • Street/strip gasoline engine application