Holley 4150 Ultra HP Series Carburetors
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Trust Holley's hard-core carburetors for serious high performance
Based on the 4150 HP carb and available in 650, 750, or 950 cfm,
the Ultra line has billet metering blocks and baseplate. Changeable emulsion jets, idle feed restrictors & power valve restrictors enable infinite tuning of nearly any engine.
Shared SpecificationsCalibrated for gasolineNonstick gasketsHigh-strength sealing surfacesBuilt-in oversized glass sight windowsCenter-hung dual inlet floatsNotched floats and jet extensions for continuous fuel deliveryPower valve blowout protectionFour corner idle systemButtonhead throttle plate screws for less air restrictionStainless steel throttle plates for corrosion protectionContoured Venturi inlet provides more balanced airflow, which increases powerSpun-in boosters won't fall into engineProgressive mechanical secondariesPrimary and secondary accelerator pumps are both 30cc100% wet-flow tested and calibratedScrew-in air bleedsBillet metering blocks and billet baseplateChangeable emulsion jets, idle feed restrictors, and power valve restrictorsDichromate finish
Spec VariationsOffered in 650, 750, or 950 cfmSpun-in boosters are straight or down leg
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