This Holley Ultra XP carburetor is a lightweight, high-performance 4150-style unit built for drag race, circle track, and high-horsepower applications. It features all-aluminum construction, a Hard Core Gray hard-coat anodized finish with black billet metering block and booster inserts, and mechanical secondaries for consistent off-the-line launches.
Specifications:
- CFM: 650
- Barrel Quantity: 4
- Body Material: Aluminum
- Finish: Hard Core Gray with Black Billet
- Flange Type: Square/4150
- Fuel Type: Gasoline
- Secondaries: Mechanical
- Fuel Inlet: Dual, 8AN O-ringed
- Throttle Bore: 1.688 in.
- Part Number: 0-80802HBX
Designed with a dual mounting pattern so it fits manifolds machined for either a 4150 or 4500-series carburetor.
FAQ
What CFM rating does this carburetor have?
It's rated at 650 CFM.
Does it use mechanical or vacuum secondaries?
It uses mechanical secondaries for immediate throttle response off the line.
What flange pattern does it use?
It has elongated dual-pattern mounting holes that fit both square-flange (4150-style) and large-flange (Dominator-style) intake manifolds.
What finish does this carburetor have?
It comes in Hard Core Gray hard-coat anodized finish with a black anodized billet metering block and booster inserts.

