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Holley Street HP Series 950 CFM Four Barrel Street/Strip Carburetor features a contoured main body made from the 4150 HP with a tumble polished shiny finish. The metering system includes a timed spark port for vacuum advance distributors and is calibrated for outstanding throttle response and drivability on hot street/race engines. A street HP base plate is used for plenty of vacuum ports for power brakes, PCV, etc. Other features include mechanical secondaries for optimum tire-turning performance, power valve blow-out protection, non-stick gaskets, adjustable air bleeds, four corner idle system, Ford kick-down and down-leg boosters.