Description
Discover Xtreme Performance with Holley Ultra XP™ carburetors! These cutting-edge carburetors redefine racing standards, boasting up to a 38% reduction in weight compared to traditional race carbs, a 20% increase in fuel capacity, and 30 innovative features. Available in the all-new Hard Core Gray™ hard coat anodized finish with Black™ billet for enhanced corrosion protection, or in natural tumble-polished aluminum with your choice of Black™ or Red™ metering blocks and base plate. The Aluminum Ultra XP series is available in 600, 650, 750, 850, and True 950-CFM, making them the ultimate square bore race carburetors.
Key Features:
- Aluminum Construction (4.5 lbs lighter – 38% weight savings)
- Shiny with red anodized billet aluminum metering blocks and base plate
- Designed for Drag race, circle track, or any high horsepower engines
- Contoured venturri inlet for balanced airflow and increased horsepower
- Outward-moved air bleeds for a smoother airflow transition from the top to the venturii
- Metering blocks with improved durability, true gasket sealing, and full adjustability (emulsion bleeds, power valve channel restrictors & idle feed restrictors)
- Integrated idle bypass valve for precise idle adjustments without compromising throttle plate to transfer slot relationship. Ideal for radical camshafts.
- Dual 30cc accelerator pumps for optimal fuel delivery from idle to full throttle
- Fuel bowls with 20% more capacity and internal baffling for controlled slosh
- Clear sight windows on both sides for easy and safe fuel level adjustments
- Built-in drain plug in front center of bowl for easy access to empty contents
- 8AN (o-ringed) inlet threads for versatile plumbing options, accessible from either side
- 4 corner idle for precise control of the idle system
- Mechanical Secondaries for flawless off-the-line launches
- Elongated (dual pattern) mounting holes for fitment on intakes with square flange (Holley 4150™ style) or large flange (Holley Dominator® style)
- Knurled (hand adjustable) primary and secondary curb idle screws for tool-free idle adjustment
- Primary throttle shaft capped to prevent debris entry
- Factory machined accessory mounting hole for easy addition of adjustable primary throttle stop
- New secondary pump cam lever for positive throttle stop on the secondary side
- Stainless steel adjustable secondary link providing a choice of 1:1 or progressive secondary throttle actuation for ultimate control
- Baseplate designed with a machinable boss for vacuum source
- Includes notched float and jet extensions
- 100% wet-flow tested by Holley technicians to ensure it arrives ready to run!
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