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Holley 0-80803RDX 4150 750 CFM Ultra XP Carburetor

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#425080803RDX

Holley 0-80803RDX 4150 750 CFM Ultra XP Carburetor

Xtreme Performance - Holley Ultra XP™ carburetors!
Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 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.

$1,168.95

/each

Factory Shipped

$1,299.95

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Product Summary

4-Barrel Carburetor Barrels, Gasoline Fuel Type

Xtreme Performance - Holley Ultra XP™ carburetors!
Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 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.

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Key Specs

Carburetor Barrels	4-Barrel
Fuel Type	Gasoline
Choke Type	No Choke
CFM Range	700-799 CFM
CFM	750 CFM

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Holley 0-80803RDX Details

Xtreme Performance - Holley Ultra XP™ carburetors! Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 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 XP comes in 600, 650, 750, 850, and True 950-CFM. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate starvation, integrated fuel shelf to minimize fuel aeration and internal baffling to control fuel slosh. Other features include all aluminum construction, fully tunable billet metering blocks, billet base plate, adjustable secondary linkage and knurled (hand adjustable) curb idle screws. Holley Ultra XP carburetors are the ultimate in square bore race carburetors!

Specs

Barrel Quantity: 4
Barrels: 4
Billet Color: Shiny with Red Billet
Body Color: Polished
Body Finish: Polished
Body Material: Aluminum
Booster: Downleg
Booster Design: Downleg
Brand: Holley
Carburetor Material: Aluminum
Carburetor Use: Professional Race
Category: Air and Fuel Delivery
CFM Rating: 750
Choke: None
Choke Type: None
Circuit Count: 2
Color: Polished/Red
Condition: New
Cubic Feet Per Minute Rating: 750
Emission Code: 3
Finish: Polished/Red
Flange Shape: Square
Flange Type: 4150/4500
Fuel: Gasoline
Fuel Inlet: Dual
Fuel Type: Gasoline
Grade Type: Performance
Linkage Attached: Yes
Marine Approved: No
Material: Aluminum
Model: 4150
Mounting Hole Quantity: 4
Part Type: Carburetor
Primary Jet Diameter: 76
Primary Main Jet Size: 76
Primary Power Valve: 6.5
Primary Pump Nozzle Size: 32
Product Type: Carburetor
Secondary Barrel Type: Mechanical
Secondary Main Jet Size: 76
Secondary Pump Nozzle Size: 32
Spacer Included: No
Sub Category: Carburetion
Supercharger Compatible: No
Throttle Bore Diameter: 1.688 inch
Venturii Size: 1.376 inch
Warning: California Proposition 65
Warranty: Manufacturer's Limited 90 Day Warranty

Rebates

Holley October Promo 10% Off Select Parts Sale

Holley's October Promo 10% Off Select Parts Sale, running from September 28, 2026, through November 1, 2026. For a limited time, customers can save up to 10% off on select Holley parts, making it the perfect opportunity to upgrade your ride with premium Holley branded parts including Holley, Brawler, Quick Fuel, Leg Wheels, Rev Wheels, Rocket Racing, Flowtech, Edge, Racequip, Apr and Dinan. Purchases must be made between September 28, 2026, through November 1, 2026. This limited-time offer applies to qualifying Holley branded parts purchased during the promotional period. Following the promotion, these parts will revert back to standard pricing.

Guides & Documents

Carburetors Installation Instructions (425080803RDX)

CARB Warning

For use on pre-1966 vehicles only

Emissions warning: this part only legal for sale or use in California if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. ++any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering there are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CA Prop 65

CARB warning

Holley 0-80803RDX Specifications

KEY SPECS
MFG. Part #	0-80803RDX
Brand	Holley
Carburetor Barrels	4-Barrel
Fuel Type	Gasoline
Choke Type	No Choke
CFM Range	700-799 CFM
CFM	750 CFM
Carburetor Flange Type	4-Barrel Square Bore
Finish	Polished
Material Type	Aluminum
Color	Silver/Red
Secondary Type	Mechanical
Fuel Inlet Type	Dual
Gasket(s) Included	Yes
New or Remanufactured	New
Throttle Linkage Type	Universal
Supercharged Application	No

GENERAL
Model	4150
Booster	Downleg
Throttle Bore	1.688 inch
Primary Power Valve	6.5
Primary Pump Nozzle Size	32
Primary Jet Size	76
Secondary Jet Size	76
GTIN Code	090127713457
Sold in Quantity	Each

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