Experience the pinnacle of performance with Holley Ultra XP™ Circle Track Carburetors! Boasting a remarkable 38% weight reduction compared to traditional race carbs, a 20% increase in fuel capacity, and 30 innovative features, these carburetors are a true testament to Xtreme Performance. Choose between the Hard Core Gray™ hard coat anodized finish with Black™ billet for superior corrosion protection or the natural tumble-polished aluminum version with Black™ metering blocks and base plate. The Aluminum Ultra XP Circle Track carbs are available in 650 & 750 CFM, tailored for the demands of circle track racing.
Key Features:
- Aluminum Construction (saves 4.5 lbs - 38% weight savings)
- Hard Core Gray with black anodized billet aluminum metering block and booster inserts
- Specifically calibrated for circle track use
- Set screw in the base plate for wide-open throttle stop adjustment
- PTFE coated throttle shafts ride in oil-impregnated bronze bushings for smooth throttle actuation
- Anti-siphon valve in the main body to reduce pump pullover
- Contoured venturri inlet offers balanced airflow for increased horsepower
- Outward-moved air bleeds for a smoother transition of airflow from the top to the venturii
- Metering blocks feature improved durability, true gasket sealing, and full adjustability (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. Ideal for 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
- Clear sight windows on both sides for easy and safe fuel level adjustments
- Built-in drain plug in the front center of the bowl provides easy access to empty contents -8 (o-ringed) inlet threads offer versatile plumbing options and can be plumbed from either side; comes from the factory with 8AN inlet fittings
- 4 corner idle allows you to precisely control your idle system
- Internal pump passage in the metering block equipped with a tunable bleed off for further tuning of accelerator pump
- 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 & contaminants
- Factory machined accessory mounting hole for easy addition of adjustable primary throttle stop. New secondary pump cam lever designed to provide a positive throttle stop on the secondary side
- Set up with 1:1 throttle actuation
- Baseplate designed with a boss that can be consumer machined for a vacuum source
- Includes wedge floats
- 100% wet-flow tested by Holley technicians to assure it arrives ready to run!
- Local Pickup Available:
- No
- Local Delivery Available:
- No
- Additional Handling:
- No
