HOLLEY 4150 ALUM ULTRA XP 750 CFM CIRCLE TRACK

Description

HOLLEY 4150 ALUM ULTRA XP 750 CFM CIRCLE TRACK

Xtreme Performance – Holley Ultra XP Circle Track carburettors! Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They’re available in our Hard Core Gray hard coat anodised finish with Black billet for improved corrosion protection & also available in natural tumble-polished aluminium with Black metering blocks and base plate. The Aluminium Ultra XP Circle Track carbs are available in 650 & 750 CFM’s. Holley Ultra XP carburettors are Specifically Calibrated for Circle Track & offer new features such as anti-siphon valve in the main body; high capacity fuel bowls which feature 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 aluminium construction, fully tunable billet metering blocks, billet base plate, wedge floats, adjustable secondary linkage and knurled (hand adjustable) curb idle screws. Holley Ultra XP carburettors are the ultimate in square bore race carburettors!Features:Aluminium Construction (saves 4.5 lbs – 38% weight savings)Shiny with black anodised billet aluminium metering blocks and base plateCalibrated specifically for use on circle trackHas a set screw in the base plate for wide open throttle stop adjustmentPTFE coated throttle shafts rides in oil impregnanted bronze bushings for smooth throttle actuationAnti-siphon valve in main body to reduce pump pulloverContoured venturri inlet offers balanced airflow for increased horsepowerAir bleeds moved outward to allow a smoother transition of airflow from the top of the carburettor into the venturiiMetering blocks feature improved durability, true gasket sealing and fully adjustable (emulsion bleeds, power valve channel restrictors & idle feed restrictors)Integrated idle bypass valve eliminates the need for holes in throttle plates and allows for proper adjustment of idle while maintaining correct throttle plate to transfer slot relationship. Helps maintain good idle control when using radical camshafts.Dual 30cc accelerator pumps provide the perfect amount of fuel from idle to full throttleFuel bowls provide 20% more fuel capacity while controlling slosh with internal bafflingClear sight windows on both sides of bowls for easy and safe fuel level adjustmentsBuilt in drain plug in front center of bowl provides easy access to empty contents of bowl-8 (o-ringed) inlet threads offer a large variety of plumbing options and can be plumbed from either side; comes from the factory with 8AN inlet fittings4 corner idle allows you to precisely control your idle systemInternal pump passage in metering block equipped with a tunable bleed off for further tuning of accelerator pumpKnurled (hand adjustable) primary and secondary curb idle screws allow for easy idle adjustment without the use of toolsPrimary throttle shaft capped to prevent entry of debris & contaminatesFactory machined accessory mounting hole for easy addition of adjustable primary throttle stop. New secondary pump cam lever designed to provide positive throttle stop on secondary sideSet up with 1:1 throttle actuationBaseplate designed with a boss that can be consumer machined for vacuum sourceIncludes wedge floats100% wet-flow tested by Holley technicians to assure it arrives ready to run!