Description
Xtreme Performance – Holley Ultra XP(TM) Circle Track Carburetors! Ultra XP carbs are 38% lighter than our original HP, 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 Cirlce Tracks are available in 650 & 750 CFM’s. Holley Ultra XP carburetors are Specifically Calibrated for Circle Track & offer new features such as anti-siphon valve in the main body; high capacity HP 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!
Resources
Installation Instructions
Specifications:
| Barrel | Four |
| Billet Color | Hard Core Gray with Black |
| Booster Type | Down Leg |
| Carburetor Type | 4150 |
| CFM | 950 |
| Choke | None |
| Circuit | 2 |
| Description_ASC | Holley Performance Emission Code 3: This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles. The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles: 1965 and older U.S. manufactured California Certified vehicles/1967 and older U.S. manufactured Federally Certified vehicles/1967 and older Foreign manufactured vehicle. The following vehicles are considered Racing Use Only Vehicles: Racing Use Only Vehicles are vehicles that are used exclusively for competition and that are not registered and that may never be used on the street. WARNING: It is against the law to install this part on an Emissions Controlled Vehicle. The following vehicles are considered Emissions Controlled Vehicles: 1966 and newer U.S. manufactured California Certified vehicles/1968 and newer U.S. manufactured Federally Certified vehicles/1968 and newer Foreign manufactured vehicle |
| Description_ASM | Mechanical Secondary |
| Description_DEF | Carburetor |
| Description_DES | Ultra XP Carburetor |
| Description_EXT | Ultra XP Carburetor; 4 bbl; 950 cfm; 2 Circuit Metering; Model 4150UXP; Mech. Secondary; Gas; Dual Fuel Inlet; Hard Core Gray w/Black Metering Block/Booster Inserts; |
| Description_FAB | 4 Corner Idle Allows You To Precisely Control Your Idle System |
| Description_FAB | 8AN O-Ringed Inlet Threads Offer A Variety Of Plumbing Options |
| Description_FAB | Air Bleeds Moved Outward For Smoother Transition Of Airflow |
| Description_FAB | Aluminum Construction |
| Description_FAB | Clear Sight Windows On Both Sides Of Bowls For Safe Fuel Level |
| Description_FAB | Contoured Venturi Inlet Balances Airflow For Increased hp |
| Description_FAB | Drain Plug On Bowl Provides Easy Access To Empty Bowl |
| Description_FAB | Dual 30CC Accelerator Pumps Fuel From Idle To Full Throttle |
| Description_FAB | Fuel Bowls Provide 20% More Fuel Capacity Controls Slosh |
| Description_FAB | Idle Bypass Valve Eliminates Holes In Throttle Plates |
| Description_FAB | Metering Blocks/True Gasket Sealing/Fully Adjustable |
| Description_FAB | Saves 4.5 Pounds 38% Weight Savings |
| Description_INV | 4150 ALUM ULTRA XP 950 CFM (HARD BLACK) |
| Description_LAB | Proposition 65 |
| Description_MKT | Xtreme Performance – Holley Ultra XP 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! Theyre available in our all-new Hard Core Gray hard coat anodized finish with Black billet for improved corrosion protection. Theyre also available in natural tumble-polished aluminum with your choice of Black or Red metering blocks and base plate. The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, 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, adjustable secondary linkage and knurled (hand adjustable) curb idle screws. Holley Ultra XP carburetors are the ultimate in square bore race carburetors! |
| Description_MKT | Xtreme Performance – Holley Ultra XP(TM) Circle Track Carburetors! Ultra XP carbs are 38% lighter than our original HP, 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 Cirlce Tracks are available in 650 & 750 CFM’s. Holley Ultra XP carburetors are Specifically Calibrated for Circle Track & offer new features such as anti-siphon valve in the main body; high capacity HP 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! |
| Description_SHO | Carburetor |
| Emission | Without EGR |
| finish | Hard Core Gray |
| Flange | Square Bore |
| Fuel Inlet | Dual |
| Fuel Type | Gasoline |
| height | 9.4 |
| length | 14.6 |
| LTL | N |
| Material | Aluminum |
| Primary Main Jet | 92 |
| Primary Power Valve | 4.5 |
| Secondary Main Jet | 92 |
| Secondary Power Valve | 4.5 |
| Secondary Pump Nozzle Size | 32 |
| Secondary Type | Mechanical |
| Supercharged Application | No |
| Throttle Bore | 1.750 in. |
| Type | Automotive |
| Usage | Street/Hi-Performance |
| Venturii Size | 1.600 in. |
| WARNING CA Proposition 65 | Yes |
| WARNING CA Proposition 65 Message | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
| weight | 9.055 |
| width | 12.7 |
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