Introducing Xtreme Performance - Holley Ultra XP™ carburetors! These cutting-edge carburetors redefine racing standards with up to a 38% reduction in weight compared to traditional models, a 20% increase in fuel capacity, and the incorporation of 30 new features. The all-new Hard Core Gray™ hard coat anodized finish with Black™ billet ensures improved corrosion protection, while the natural tumble-polished aluminum version comes with a choice of Black™ or Red™ metering blocks and base plate. Available in 600, 650, 750, 850, and True 950-CFM, the Aluminum Ultra XP series is the epitome of square bore race carburetors.
Notable features include an integrated idle bypass valve for seamless idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high-capacity fuel bowls with 20% more fuel capacity to eliminate starvation, an integrated fuel shelf to minimize fuel aeration, and internal baffling for controlled fuel slosh. Constructed entirely from aluminum, these carburetors also boast fully tunable billet metering blocks, a billet base plate, adjustable secondary linkage, and knurled (hand adjustable) curb idle screws.
Features:
- Aluminum Construction (4.5 lbs lighter - 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
- Air bleeds moved outward for a smoother airflow transition 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 for precise idle adjustment without compromising the throttle plate to transfer slot relationship
- Dual 30cc accelerator pumps for optimal fuel delivery from idle to full throttle
- Fuel bowls with 20% more capacity and internal baffling to control slosh
- Clear sight windows on both sides for easy and safe fuel level adjustments
- Built-in drain plug for convenient bowl emptying
- 8AN (o-ringed) inlet threads for versatile plumbing options, accessible from either side
- 4 corner idle for precise idle system control
- Mechanical Secondaries for flawless off-the-line launches
- Elongated (dual pattern) mounting holes for fitment on square flange or large flange intakes
- 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 offering a choice of 1:1 or progressive secondary throttle actuation
- Baseplate designed with a machinable boss for a vacuum source
- Includes notched float and jet extensions
- 100% wet-flow tested by Holley technicians to ensure it arrives ready to run!
- Local Pickup Available:
- No
- Local Delivery Available:
- No
- Additional Handling:
- No
