Q-650-B2 Q-Series Gasoline Carburetor 650 CFM [2x4 Draw-Thru]

Name: Q-650-B2 Q-Series Gasoline Carburetor 650 CFM [2x4 Draw-Thru]
Brand: QUICK FUEL
SKU: 793-Q-650-B2
Price: 1126.95 USD
Availability: InStock

^$1,126⁹⁵

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Mechanical Secondary Carburetors

650 CFM Gasoline Carburetor

for 2x4 Draw-Thru Superchargers

4150 Square Bore

Mechanical Secondary

Dual Sight Glass Fuel Bowls

Billet Metering Blocks

4-Corner Idle System

Down-Leg Boosters

PTFE Coated Shafts

Polished Aluminum

The Q-650-B2 Q-Series Carburetor is engineered for forced induction drag racing applications. With 650 CFM of airflow and a square bore 4150 flange, it is ideal for dual-carburetor draw-thru supercharger setups. Its lightweight aluminum main body is precision machined for consistent throttle response and features billet metering blocks and a billet aluminum throttle body for strength and tunability. Dual fuel bowls include sight glass windows for fast float checks, and the 4-corner idle system ensures stable idle under variable load. The carb is pre-configured for gasoline and includes notched floats and secondary jet extensions to manage fuel during hard launches.

Quick Fuel Q-650-B2 Features:

650 CFM 4-barrel with mechanical secondaries
Designed for dual 2x4 draw-thru supercharger systems
4150 square bore flange
No choke tower
Billet metering blocks with changeable channel restrictions
4-corner idle for drag racing stability
Aluminum bowls with dual sight glass
Billet throttle body with PTFE-coated shafts
Down-leg boosters
Primary jets: 68, secondary jets: 76
6.5 power valve, 32 pump nozzles
Red anodized billet components

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

Maximize Dragstrip Performance with Quick Fuel Q-Series Carburetors

Quick Fuel Q-Series Carburetors are the ultimate high-performance upgrade for bracket racers and weekend drag warriors seeking unbeatable throttle response and tuning flexibility.Built for precision and power at the track, Q-Series carburetors feature a lightweight aluminum main body with recessed air bleeds for smoother airflow and die-cast venturis machined for exceptional throttle response. Designed to handle hard launches, they include notched floats and secondary jet extensions to maintain fuel control under high g-forces. Billet metering blocks deliver a consistent fuel curve, while rugged throttle bodies enhance longevity. For racers adjusting on the fly, models with mechanical secondaries include the QuickLink system for fast secondary tuning. Available in configurations for gasoline, methanol, and E85—plus compatibility with forced induction and both vacuum and mechanical secondaries—the Q-Series is Quick Fuel’s most versatile drag racing carburetor lineup.

Part TypeCarburetor

Product LineQuick Fuel Q-Series Carburetors

BrandQUICK FUEL

Package Height7.5

Package Width11.4

Package Length13.4

Weight9.22 PG

Part CategoryPerformance Parts

Primary Power Valve (Hg)4.5 Hg

Primary Discharge Nozzle Size0.035 in (0.9 mm)

ChokeNone

Primary Jet Size72