- Circle Track
- Circle Track Engines & Components
- Holley Ultra XP 2-bbl Carburetors
The Holley Ultra XP 2-Barrel Carburetors are the first true Holley 2BBL carburetors designed and constructed specifically for racing applications. They're available in the stealthy appearing Hard Core Gray™ hard coat anodized finish or in natural tumble-polished aluminum with Black™ billet metering block and baseplate for improved corrosion protection. These carburetors are 500 CFM and will comply with the track inspection gages currently used to tech the venturi diameter#, throttle bore and throttle-shaft/ butterfly thickness!
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6061-T6 Billet Aluminum Metering Block
- Improved durability#, true gasket sealing (sealing surface integrity)#, hard coat anodized for good looks and superior corrosion protection
- Power valve channel restrictors now machined lower in metering block for improved fuel delivery to power valve circuit
- Accelerator pump channel now internally drilled eliminating need for external plug
- Excess material removed for improved fuel capacity
- Integrated pry-point assists in disassembly from fuel bowl and mainbody preventing damage to gaskets and gasket surfaces
- New snap in place bowl vent whistle makes removal and/or replacement easier
6061-T6 Billet Aluminum Base Plate - Improved durability#, true gasket sealing#, hard coat anodized for good looks and superior corrosion protection
- Dedicated race-only throttle lever with all unnecessary street attachment points & tangs removed
- Knurled (hand adjustable) curb idle screws allow for easy idle adjustment without the use of tools
- Throttle shaft capped to prevent entry of debris & contaminates
All-New Fuel Bowl Design - Completely redesigned from the ground up for racing
- 20% more fuel capacity vs. a traditional v-bowl eliminates fuel starvation and provides consistent air/fuel ratios
- Internal baffling to help control fuel slosh and minimize float level fluctuations in hard launching or cornering situations
- Fuel shelf below the needle and seat to greatly minimize fuel aeration and promote more consistent metering
- Fuel trough designed into floor of bowl to route fuel flow directly to the jets and assist in keeping jets covered by fuel
- Clear Pyrex® 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
- Contoured entry provides smooth fuel flow directly to needle & seat
- -8AN (o-ringed) inlet threads offer a large variety of plumbing options (come standard with -8AN o-ring to -6AN male adapter and -8AN plug). Can be plumbed from either side
- Material added in key areas (needle & seat area#, fuel inlet#, sight window area) for added strength in the demanding race environment
All-New 2BBL Racing Main Body - Air bleeds moved outward to allow a smoother transition of airflow from the top of the carburetor into the venturii
- Slash-cut vent tube
- Down-leg boosters for improved fuel signal
- No choke tower for unobstructed airflow
- All unnecessary mounting bosses removed for a smoother#, cleaner appearance with a cast in Holley logo
- Contoured hex head squirter screws for streamlined airflow
- 1-3/8'' Venturii and 1-11/16'' Throttle bore size
- Track gages currently used to tech the venturi diameter#, throttle bore and throttle-shaft/ butterfly thickness by race sanctioning bodies can still be utilized
Features:
- All aluminum construction - for nearly 50% weight savings over zinc version
- Available in Tumble polished aluminum or Hard Core Gray hard coat anodized with Black billet metering block and baseplate
- Hard coat anodizing on fuel bowls and mainbody - actually penetrates the aluminum for superior corrosion protection
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