Description
Holley - 0-80812BKX
Carburetor - Ultra XP - Model 4150 - 4-Barrel - 650 CFM - Square Bore - No Choke - Mechanical Secondary - Dual Inlet - Aluminum - Black Anodized / Tumble Polished - Each
Ultra XP Carburetor; 4bbl; 650 cfm; 2 Circuit Metering; Model 4150UXP; Mech. Secondary; Gas; Dual Fuel Inlet; Circle Track; Double Accelerator Pump; Shiny Aluminum w/Black Billet;
Xtreme Performance - Holley Ultra XP(TM); Circle Track Carburetors! 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(TM); hard coat anodized finish with Black(TM); billet for improved corrosion protection & also available in natural tumble-polished aluminum with Black(TM); metering blocks and base plate. The Aluminum Ultra XP Circle Track carbs are available in 650 & 750 CFMs. Holley Ultra XP carburetors 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 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!
- 100% wet-flow tested by Holley technicians to assure it arrives ready to run!
- Metering blocks feature improved durability, true gasket sealing and fully adjustable (emulsion bleeds, power valve channel restrictors & idle feed restrictors)
- Built in drain plug in front center of bowl provides easy access to empty contents of bowl
- PTFE coated throttle shafts rides in oil impregnanted bronze bushings for smooth throttle actuation
- Dual 30cc accelerator pumps provide the perfect amount of fuel from idle to full throttle
- Knurled (hand adjustable) primary and secondary curb idle screws allow for easy idle adjustment without the use of tools
- Includes wedge floats
- Factory 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 side
- 4 corner idle allows you to precisely control your idle system
- Anti-siphon valve in main body to reduce pump pullover
- Contoured venturri inlet offers balanced airflow for increased horsepower
- Clear sight windows on both sides of bowls for easy and safe fuel level adjustments
- Calibrated specifically for use on circle track
- Set up with 1:1 throttle actuation
- -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 fittings
- Internal pump passage in metering block equipped with a tunable bleed off for further tuning of accelerator pump
- Air bleeds moved outward to allow a smoother transition of airflow from the top of the carburetor into the venturii
- Aluminum Construction (saves 4.5 lbs - 38% weight savings)
- Primary throttle shaft capped to prevent entry of debris & contaminates
- Shiny with black anodized billet aluminum metering blocks and base plate
- Baseplate designed with a boss that can be consumer machined for vacuum source
- Has a set screw in the base plate for wide open throttle stop adjustment
- Fuel bowls provide 20% more fuel capacity while controlling slosh with internal baffling
