Description
Unleash peak performance with Holley Ultra XP™ Carburetors! These carburetors redefine racing excellence, being 38% lighter than traditional race carbs, boasting 20% greater fuel capacity, and incorporating 30 innovative features. The Hard Core Gray™ hard coat anodized finish with Black™ billet ensures superior corrosion protection, while the natural tumble-polished aluminum variant offers customization with Black™ or Red™ metering blocks and base plate options. The Aluminum Ultra XP is available in 600, 650, 750, 850, and True 950-CFM configurations.
Key Features:
- 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
- Methanol specific calibration
- Contoured venturri inlet offers balanced airflow for increased horsepower
- Outward-moved air bleeds for smoother airflow transition
- Improved durability in metering blocks with true gasket sealing and full adjustability (emulsion bleeds, power valve channel restrictors & idle feed restrictors)
- Integrated idle bypass valve for idle adjustments without throttle plate holes, maintaining correct plate-to-slot relationship, especially useful with radical camshafts
- Dual 50cc 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 for convenient bowl content emptying
- 8AN (o-ringed) inlet threads for versatile plumbing options, usable from either side
- .150″ stainless needle & seats for E-85 control
- 4 corner idle for precise idle system control
- Mechanical Secondaries for flawless off-the-line launches
- Elongated (dual pattern) mounting holes for compatibility with square or large flange intakes
- Knurled (hand adjustable) primary and secondary curb idle screws for tool-free idle adjustments
- Capped primary throttle shaft to prevent debris entry
- Slabbed and undercut throttle shaft for enhanced airflow
- Factory machined accessory mounting hole for easy primary throttle stop addition
- New secondary pump cam lever for positive throttle stop on the secondary side
- Stainless steel adjustable secondary link for 1:1 or progressive secondary throttle actuation
- Baseplate with machinable boss for custom vacuum sources
- Stainless steel throttle plates
- 100% wet-flow tested by Holley technicians to ensure it arrives ready to run!
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