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#42580803
Holley 0-80803HB Ultra XP Gas 750 CFM 4 Barrel Carburetor
- Model is 38% lighter and has increased the fuel capacity by 20%
- Fuel inlets are spaced 9.75" on center
- Fuel bowl inlets feature -8 AN O-ring port fittings to allow for a large variety of plumbing options
$1,213.95
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$1,349.95
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Product Summary
Universal Fit, 4-Barrel Carburetor Barrels, 750 CFM CFM
- Model is 38% lighter and has increased the fuel capacity by 20%
- Fuel inlets are spaced 9.75" on center
- Fuel bowl inlets feature -8 AN O-ring port fittings to allow for a large variety of plumbing options
- An integrated idle bypass valve eliminates the need for holes in throttle plates
- Features a stainless steel adjustable secondary link
Rebates Available
See rebate detailsKey Specs
| Carburetor Barrels | 4-Barrel |
| Fuel Type | Gasoline |
| Choke Type | No Choke |
| CFM Range | 700-799 CFM |
| CFM | 750 CFM |
Need To Know
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Return PolicyHolley 0-80803HBX Details
Holley 0-80803HBX Details
Holley HP™ Carburetors have been the standard in racing four barrel 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 an all–new Hard Core Gray™ hard coat anodized finish with Black™ billet for superior corrosion protection.
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Note: Fuel inlets are spaced 9.75" on center which will require a lengthened fuel line / fuel log arrangement. Fuel bowl inlets feature -8 AN O-ring port fittings to allow for a large variety of plumbing options. Fuel bowl can be plumbed from either side.
- Aluminum Construction
- Saves 4.5 lbs - 38%
- Billet Aluminum Metering Blocks
- Fully adjustable (emulsion bleeds, power valve channel restrictors and idle feed restrictors)
- Power valve channel restrictors now machined lower in metering block for improved fuel delivery to power valve circuit
- Billet Aluminum Base Plates
- Stainless steel adjustable secondary link
- Provides choice of 1:1 or progressive secondary throttle actuation for ultimate control of secondary opening rate
- All New Fuel Bowl Design
- 20% more fuel capacity vs. a traditional v-bowl eliminates fuel starvation and provides consistent air/fuel ratios
- Updated Main Body Design
- 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
- Helps maintain good idle control when using radical camshafts
- Aluminum Construction
- Saves 4.5 lbs - 38%
- Billet Aluminum Metering Blocks
- Fully adjustable (emulsion bleeds, power valve channel restrictors and idle feed restrictors)
- Power valve channel restrictors now machined lower in metering block for improved fuel delivery to power valve circuit
- Billet Aluminum Base Plates
- Stainless steel adjustable secondary link
- Provides choice of 1:1 or progressive secondary throttle actuation for ultimate control of secondary opening rate
- All New Fuel Bowl Design
- 20% more fuel capacity vs. a traditional v-bowl eliminates fuel starvation and provides consistent air/fuel ratios
- Updated Main Body Design
- 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
- Helps maintain good idle control when using radical camshafts
Charts
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
CARB Warning
For race/ off road use or for use on pre-1966 vehicles.
CARB Warning
For race/ off road use or for use on pre-1966 vehicles.
Holley 0-80803HBX Specifications
Holley 0-80803HBX Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 0-80803HBX |
| 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 | Satin |
| Material Type | Aluminum |
| Color | Black |
| Secondary Type | Mechanical |
| Fuel Inlet Type | Dual |
| Gasket(s) Included | No |
| New or Remanufactured | New |
| Throttle Linkage Type | Universal |
| Supercharged Application | No |
| GENERAL | |
| Bolt Hole Pattern | 5.160" x 5.625" |
| Notes | Fuel inlets are 9.75" C to C. Can be plumbed from either side. |
| GTIN Code | 090127671016 |
| Sold in Quantity | Each |
Ratings & Reviews
4.5
2 Reviews
Customers appreciate the superior performance quality of this product, rating it as an effective and robust powerhouse. The 750cfm carburetor demonstrates excellent adjustability, with merely jets and floats requiring tweaks. Notably, the unit rendered impressive results right out of the box, although some found it slightly "fat". The elegant and durable finish is also favorably mentioned. Superior to fuel ejection options, this product has demonstrated winning results from first use, solidifying it as a top choice.
Ratings & Reviews
4.5
2 Reviews
Customers appreciate the superior performance quality of this product, rating it as an effective and robust powerhouse. The 750cfm carburetor demonstrates excellent adjustability, with merely jets and floats requiring tweaks. Notably, the unit rendered impressive results right out of the box, although some found it slightly "fat". The elegant and durable finish is also favorably mentioned. Superior to fuel ejection options, this product has demonstrated winning results from first use, solidifying it as a top choice.
4.5
2 reviews
5
1
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Filter by Ratings
Who needs fuel ejection
5.0
4 years ago
Bow tie Pete
NJ
Verified
Would buy again
Would Recommend
750cfm
4.0
10 years ago
Bootleg
Central California
Verified
Carb is a beast! Only adjustements required have been the jets and floats. It was a little "fat" out of the box but a simple adjustment on the floats and this carbs performance is excellent. The finish is nice as well. Won with it the first night.
Would Recommend
Showing 2 of 2 reviews
Questions & Answers
Questions & Answers
1 Question • 1 Answer
What fuel log should I use for this carb. I previously bought a BSB for the first carb i bought from you, and had to spend fifty bucks on adapters to make it work.
by Eric
• 9 years ago
1 answer
View Answer
1 of 1 questions shown