CARBURETOR

Ultra XP Carburetor; 4 bbl; 850 cfm; Model 4150UXP; Mechanical Secondary; No Choke; E85; Dual Fuel Inlet; 1.750 in. Throttle Bore; 1.563 in. Venturi Size; Hard Core Gray. Xtreme Performance - Holley Ultra XP™ Circle Track Carburetors! Ultra XP carbs are 38% lighter than original HP, have 20% greater fuel capacity, and 30 other new features. Available in Hard Core Gray™ hard coat anodized finish with Black™ billet for improved corrosion protection, and also in natural tumble-polished aluminum with Black™ metering blocks and base plate. The Aluminum Ultra XP Circle Tracks are available in 650 & 750 CFM. Specifically Calibrated for Circle Track, offering new features such as anti-siphon valve in the main body; high capacity HP bowls with 20% more fuel capacity to eliminate starvation, integrated fuel shelf to minimize fuel aeration, and internal baffling to control fuel slosh. Other features include all aluminum construction, fully tunable billet metering blocks, billet base plate, wedge floats, adjustable secondary linkage, and knurled (hand adjustable) curb idle screws. Holley Ultra XP carburetors are the ultimate in square bore race carburetors!