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4150 Ultra HP Series – Aluminum

950CFM Shiny with Red Billet, Aluminum Ultra HP

PART #: 0-80805RD

UPC #: 090127597156

Emission Control Number 3


Holley HP™ Carburetors have been the standard in racing Carburetors for nearly two decades. So how do you make them better? You make them 38% lighter, increase the fuel capacity by 20% and add 30 other new features! They're available in our all–new Hard Core Gray™ hard coat anodized finish with Black™ billet for improved corrosion protection. They're also available in natural tumble–polished aluminum with your choice of Black™ or Red™ metering blocks and base plate. The Aluminum Ultra HP comes in 600, 650, 750, 850, and True 950–CFM.

*Requires 9.75–inch spread fuel line, options at the bottom of the page.

• 100% Holley – Made in the U.S.A.
• 97% aluminum construction
• 38% weight savings
• 20% more fuel bowl capacity
• 10 new fuel bowl features
• 10 new base plate features
• 6 new metering block features
• 5 new main–body features
• 1 new carburetor...Ultra HP
950CFM Shiny with Red Billet, Aluminum Ultra HP


Features
  • American Made - Materials and Assembly
  • Aluminum Construction (saves 4.5 lbs - 38% weight savings)
6061T6 BILLET ALUMINUM METERING BLOCKS
  • Improved durability, true gasket sealing (sealing surface integrity), bright dipped anodized for good looks and corrosion protection
  • Fully adjustable (emulsion bleeds, power valve channel restrictors & idle feed restrictors). 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
6061T6 BILLET ALUMINUM BASE PLATES
  • Improved durability, true gasket sealing, bright dipped anodized for good looks and corrosion protection
  • Elongated (dual pattern) mounting holes allow fitment on intakes with square flange (Holley 4150™ style) or large flange (Holley Dominator® style)
  • Dedicated race-only throttle lever with all unnecessary street attachment points & tangs removed
  • 950 CFM throttle shaft comes slabbed and undercut for improved airflow
  • Stainless steel adjustable secondary link. Provides choice of 1:1 or progressive secondary throttle actuation for ultimate control of secondary opening rate
  • 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 & contaminates
  • Factory machined accessory mounting hole for easy addition of adjustable throttle stop
  • Throttle body and new secondary pump cam lever designed to provide positive throttle stop on secondary side. Delivers safe & reliable 90° opening and return of throttle plates while ensuring maximum airflow
  • Baseplate designed with a boss that can be consumer machined for vacuum source
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 sight windows on both sides of bowls for easy and safe fuel level adjustments
  • (A) Built in drain plug in front center of bowl provides easy access to empty contents of bowl
  • (B) 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
  • Note: New lengthened fuel line required due to increased length of bowls (see Holley p/n 34-42, 34-43, 34-44 or Earl’s p/n AT104195ERL, AT104295ERL & AT104286ERL)
UPDATED MAIN BODY DESIGN
  • Air bleeds moved outward to allow a smoother transition of airflow from the top of the carburetor into the venturii
  • 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. H elps maintain good idle control when using radical camshafts.
  • All unnecessary mounting bosses removed for a smoother, cleaner appearance
  • Contoured hex head squirter screws for streamlined airflow
  • Cast in Holley HP logo for easy identification by race sanctioning bodies
  • Available in 600, 650, 750, 850 and True 950 CFM
  • Available tumble polished with Red™ or Black™ billet.
  • Available in all new Hard Core Gray™ hard coat anodized with Black™ billet. First-ever hard coat anodizing on fuel bowls and mainbody - actually penetrates the aluminum for superior corrosion protection.
  • Adjustable Throttle Stop bracket and WOT Microswitch brackets available
ORIGINAL HP FEATURES
  • Power valve blowout protection
  • 4-corner idle
  • 30cc GLFT accelerator pumps
  • Screw-in air bleeds
  • Dominator style fuel bowls allow plumbing from either side
  • Symmetrical venturii bores
  • Spun in boosters
  • Notched floats and jet extensions
  • Stainless steel throttle plates


Technical Information

Shipping Dimensions
L 14.250 in. x W 12.380 in. x H 9.130 in.
Weight 9.200 lb.
BottomCurve

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