Product Overview
The iFJF 1805 Thunder AVS 650 CFM carburetor delivers classic muscle car performance with modern manufacturing precision. Featuring annular discharge boosters, manual choke operation, and a clean satin-finish aluminum body, it's the go-to upgrade for small block V8s from 283 to 400 cubic inches. Whether you're building a weekend cruiser, a street/strip car, or restoring a classic, the 1805 provides reliable fuel delivery and crisp throttle response.
Key Features
650 CFM Airflow — The ideal CFM rating for street-driven small block V8s. Provides excellent throttle response without the low-speed drivability issues that plague oversized carburetors.
Annular Discharge Boosters — Eight precision-drilled discharge holes per booster atomize fuel more effectively than single-point boosters, resulting in smoother idle, better part-throttle response, and improved fuel economy.
Manual Choke — Simple, reliable cable-operated choke. No electrical connections, no vacuum diaphragms to fail. You control exactly when to engage and disengage.
Two-Piece Aluminum Body — Die-cast aluminum construction with fewer gasket surfaces than three-piece designs means fewer potential leak points and greater durability.
Square Bore Mounting — Direct bolt-on for most aftermarket 4-barrel intakes (Edelbrock Performer, RPM, Weiand, Holley) and factory square bore manifolds.
Compatibility
Engine Family
Displacement
Typical Applications
Chevy Small Block
283, 305, 307, 327, 350, 383, 400
Camaro, Chevelle, Nova, C10, Impala, Monte Carlo
Ford Small Block
289, 302, 351W
Mustang, F-150, Bronco, Fairlane, Torino
Mopar Small Block
273, 318, 340, 360
Charger, Challenger, Dart, Duster, Ram
AMC V8
290, 304, 343, 360, 390, 401
Javelin, AMX, CJ-5, CJ-7, Wagoneer
Buick/Olds/Pontiac
300-455
Square bore intake required (verify manifold pattern)
Specifications
Parameter
Value
Part Number
1805
CFM Rating
650 CFM
Barrels
4-Barrel Square Bore
Choke
Manual Choke
Booster Type
Annular Discharge
Primary Jet
0.095"
Secondary Jet
0.098"
Body Material
Die-Cast Aluminum (Satin)
Fuel Inlet
5/8"-20 Thread
Why iFJF 1805 vs. OEM?
Factory carburetors from the 60s-80s are now 40-60 years old. They suffer from warped castings, corroded passages, worn throttle shafts, and degraded accelerator pumps. Our 1805 is brand new — no core required, no rebuilding, no surprises. The annular boosters found on the Thunder AVS are a genuine upgrade over standard boosters, providing fuel atomization comparable to fuel injection at a fraction of the cost. Each unit is wet-flow tested and pre-calibrated for out-of-the-box performance.
Frequently Asked Questions
Q: Will this bolt onto a stock Chevy 350 intake manifold?A: Yes — as long as your intake manifold has a square bore flange pattern. Most 1966-and-later Chevy small block intakes are square bore. If you have a spread bore manifold (e.g., some Quadrajet applications), you'll need an adapter.
Q: What's included in the box?A: Carburetor, base gasket, mounting studs/nuts/washers, and installation instructions.
Q: Can I use this with an automatic transmission?A: Yes. The 1805 works with both automatic and manual transmissions. You'll need to connect your transmission's kickdown linkage (TH350/TH400/700R4) using the provided throttle lever.
Q: How do I hook up the manual choke?A: Route a universal choke cable (not included) from the choke lever on the carburetor, through the firewall grommet, to a dash-mounted pull knob. Most auto parts stores carry universal choke cable kits for $10-20.
Q: Will this work at high altitude (5,000+ ft)?A: At high altitude, you may need to lean the mixture. The 1805 accepts standard Edelbrock/Thunder-series jets and metering rods for calibration. For altitudes above 5,000 ft, go down 1-2 jet sizes.
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