Ultra Xp Carburetor

Description

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! They're available in our all-new Hard Core Gray™ hard coat anodized finish with Black™ billet for improved corrosion protection. They're 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!

For over a century Holley has driven the cutting edge of fuel-system design. That work continues today through Holley’s market-leading EFI products as well as through Holley’s family of best-in-industry brands. Top brands like MSD, Flowmaster, Hurst, Accel, and many more make up the industry’s leading offering of enthusiast-driven products to deliver robust, complete performance solutions for builders, racers, and drivers. From propelling the LS-, Coyote-, and Gen 3 Hemi-swap trends, to continuously innovating late-model and vintage vehicle performance, Holley’s commitment to its customers and their cars is at the core of everything we do.

Fitment

This part fits the following vehicles.

• 1952-1954 Allard J2X
• 1952-1954 Allard Monte Carlo
• 1952-1954 Allard Safari
• 1952-1958 Buick Roadmaster
• 1952-1964 Cadillac Series 60 Fleetwood
• 1952-1964 Cadillac Series 62
• 1952-1964 Cadillac Series 75 Fleetwood
• 1952-1964 Oldsmobile Super 88
• 1952-1984 Cadillac Commercial Chassis
• 1952-1984 Oldsmobile 98
• 1953-1954 Cunningham Continental
• 1953-1954 Lincoln Cosmopolitan
• 1953-1954 Packard Cavalier
• 1953, 1955-1956 Packard Patrician
• 1953, 1957-1964 Oldsmobile Fiesta
• 1953-1959 Lincoln Capri
• 1953-1978, 1981-1982 Cadillac Eldorado
• 1953-1982 Cadillac DeVille
• 1954-1955 Facel Vega FV
• 1954-1955 Facel Vega FV1
• 1954-1955 Kurtis 500M
• 1954-1956 Ford Customline
• 1954-1956 Ford Mainline
• 1954-1956 Mercury Custom
• 1954-1957, 1961-1966 Oldsmobile Starfire
• 1954-1958, 1973-1981 Buick Century
• 1954, 1958 Packard Packard
• 1954-1958 Siata 200CS
• 1954-1959, 1961-1974 Mercury Monterey
• 1954-1959 Ford Club
• 1954-1959 Ford Skyliner
• 1954-1960 Ford Sunliner
• 1954-1960 Ford Victoria
• 1954, 1961-1972, 1975-1979 Buick Skylark
• 1954-1974 Ford Country Sedan
• 1954-1974 Ford Country Squire
• 1954-1974 Ford Ranch Wagon
• 1954-1975 Chrysler Imperial
• 1954-1981 Chrysler Newport
• 1954-1981 Chrysler Town & Country
• 1954-1982 Chrysler New Yorker
• 1954 Allard K3
• 1954 Ford Crestline
• 1955-1956 Chrysler St Regis
• 1955-1956 Packard Clipper
• 1955-1956 Packard Four-Hundred
• 1955-1956 Studebaker E12
• 1955-1956 Studebaker E13
• 1955-1956 Studebaker E28
• 1955-1956 Studebaker E38
• 1955-1956 Studebaker E7
• 1955-1956 Studebaker Police Car
• 1955, 1957-1960 Ford Courier Sedan Delivery
• 1955-1957 Chevrolet One-Fifty Series
• 1955-1957 Chevrolet Two-Ten Series
• 1955-1958, 1964-1966 Studebaker Commander
• 1955-1958 Buick Super
• 1955-1958 Plymouth Plaza
• 1955-1958 Pontiac Chieftain
• 1955-1958 Pontiac Pathfinder
• 1955-1958 Studebaker President
• 1955-1959, 1961-1962 Dodge Lancer
• 1955-1959, 1964-1968 Mercury Montclair
• 1955-1959, 1965-1976 Dodge Coronet
• 1955-1959 DeSoto Fireflite
• 1955-1959 Dodge Royal
• 1955-1959 Dodge Sierra
• 1955-1961 Dodge Custom
• 1955-1961 Plymouth Suburban
• 1955-1964 Plymouth Savoy
• 1955-1966, 1973-1976, 1979 Ford F-100
• 1955-1966, 1973-1979, 1983-1987 Ford F-250
• 1955-1966 Pontiac Star Chief
• 1955-1970 Ford Fairlane
• 1955-1971 Plymouth Belvedere
• 1955-1974, 1977-1981 Pontiac Laurentian
• 1955-1975, 1981 Chevrolet Bel Air
• 1955-1976 Ford Thunderbird
• 1955-1979, 1983-1987 Ford F-350
• 1955-1981 Chevrolet Corvette
• 1955-1981 Pontiac Catalina
• 1955 Lincoln Custom
• 1956-1957 Chrysler Windsor
• 1956-1957 Lincoln Mark II
• 1956-1957 Oldsmobile 88
• 1956-1957 Studebaker Transtar
• 1956-1958 Dual-Ghia 240
• 1956-1958 Dual-Ghia 500
• 1956-1958 Mercury Medalist
• 1956-1959 Lincoln Premier
• 1956-1978 Plymouth Fury
• 1956 Chrysler Nassau
• 1956 Dodge Texan
• 1956 Ford Park Lane Wagon
• 1956 Oldsmobile Deluxe 88
• 1956 Packard Executive
• 1956 Studebaker Golden Hawk
• 1956 Studebaker Power Hawk
• 1956 Studebaker Sky Hawk
• 1957-1958 Chevrolet Del Ray

Showing 100 of 555 vehicles. Use the fit check above to see whether this part fits yours.

Features & benefits

• Air bleeds moved outward to allow a smoother transition of airflow from the top of the carburetor into the venturii
• Metering 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 throttle
• Fuel bowls provide 20% more fuel capacity while controlling slosh with internal baffling
• Aluminum Construction (saves 4.5 lbs - 38% weight savings)
• Hard Core Gray with black anodized billet aluminum metering block and booster inserts
• Designed for use on Drag race, circle track, or any high horsepower engines
• Contoured venturri inlet offers balanced airflow for increased horsepower
• Clear sight windows on both sides of bowls for easy and safe fuel level adjustments
• Built in drain plug in front center of bowl provides easy access to empty contents of bowl
• 8AN (o-ringed) inlet threads offer a large variety of plumbing options and can be plumbed from either side
• 4 corner idle allows you to precisely control your idle system
• Mechanical Secondaries for perfect off the line launches
• Elongated (dual pattern) mounting holes allow fitment on intakes with square flange (Holley 4150™ style) or large flange (Holley Dominator® style)
• Knurled (hand adjustable) primary and secondary curb idle screws allow for easy idle adjustment without the use of tools
• Primary throttle shaft capped to prevent entry of debris & contaminates
• 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
• Stainless steel adjustable secondary link. Provides choice of 1:1 or progressivesecondary throttle actuation for ultimate control of secondary opening rate
• Baseplate designed with a boss that can be consumer machined for vacuum source
• Includes notched float and jet extensions
• 100% wet-flow tested by Holley technicians to assure it arrives ready to run!

Specifications

Magnuson-Moss Warranty Act

Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)).