Holley Ultra XP 2-bbl Carburetors

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