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!


Barrels 4

Billet Color Hard Core Gray with Black

Booster Down Leg

Brand Holley

CFM 850

Choke None

Circuit 2

Condition New

Emission Code 3

Finish Hard Core Gray

Fuel Gasoline

Fuel Inlet Dual

Marine Use No

Material Aluminum

Model 4150

Primary Main Jet 84

Primary Power Valve 4.5

Primary Pump Nozzle Size 32

Product Type Ultra XP Carburetor

Secondaries Mechanical

Secondary Main Jet 84

Secondary Pump Nozzle Size 32

Supercharged Application No

Throttle Bore 1.750 inch

Venturii Size 1.563 inch

More Information
Part Type Carburettors
Product Line Air & Fuel Delivery
Brand Holley
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