Description
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
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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.
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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.
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Manual Choke — Simple, reliable cable-operated choke. No electrical connections, no vacuum diaphragms to fail. You control exactly when to engage and disengage.
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Two-Piece Aluminum Body — Die-cast aluminum construction with fewer gasket surfaces than three-piece designs means fewer potential leak points and greater durability.
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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.
