Description
1406 600 CFM Performer Carburetor — Electric Choke, 4-Barrel Square Bore
The iFJF 1406 Performer carburetor is a precision-engineered 600 CFM 4-barrel square bore carburetor with automatic electric choke — a direct replacement for the legendary Edelbrock 1406. Designed for street performance and mild race applications on 350-454ci V8 engines, this carburetor delivers crisp throttle response, consistent fuel metering, and hassle-free cold starts every time.
Key Features
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600 CFM Flow Rating: Optimized for street performance V8 engines from 350 to 454 cubic inches. Delivers excellent throttle response with good fuel economy at cruise.
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Automatic Electric Choke: 12V heating element progressively opens the choke plate — no cables, no manual intervention. Just turn the key and go.
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4-Barrel Square Bore: Direct bolt-on for Edelbrock Performer, Performer RPM, and most OEM and aftermarket square bore intake manifolds.
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Vacuum Air Valve Secondary: Demand-based secondary opening prevents bog while delivering full CFM when you need it. Far more street-friendly than mechanical secondaries.
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Externally Tunable: Idle mixture screws, metering rods, step-up springs, and accelerator pump all accessible without removing the carburetor.
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No EGR Provision: Clean design without exhaust gas recirculation ports — ideal for pre-emissions vehicles and off-road/racing applications.
Technical Specifications
| Specification |
Value |
| CFM Rating |
600 CFM @ 1.5 inHg |
| Barrel Configuration |
4-Barrel, Square Bore |
| Choke Type |
Automatic Electric (12V) |
| Secondary Type |
Vacuum Air Valve (Adjustable) |
| Fuel Inlet |
Single 5/8"-20 UNF |
| Throttle Bore |
Prim 1-7/16" / Sec 1-11/16" |
| Float Level |
7/16" from bowl top (idle) |
| Fuel Pressure |
5.5 psi maximum |
1405 vs 1406: Which Should You Choose?
| Feature |
1405 (Manual Choke) |
1406 (Electric Choke) |
| Choke Control |
Cable (driver-operated) |
Automatic (12V heated) |
| Best For |
Race cars, off-road, hot rods |
Daily drivers, street cars, cruisers |
| Cold Start |
Driver sets choke, adjusts as engine warms |
Automatic — turn key and go |
| Wiring Required |
No (mechanical cable only) |
Yes (12V ignition-switched source) |
| Calibration |
Slightly richer for cold-start control |
Slightly leaner for fuel economy |
Tuning & Setup
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Choke Adjustment: Rotate the black choke housing to adjust choke plate closure at cold. More rotation clockwise = richer cold mixture. Mark the factory position before adjusting.
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Fast Idle: With engine cold, set fast idle to 1,500-1,800 RPM via the fast idle screw on the throttle linkage.
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Idle Mixture: Warm engine fully. Using vacuum gauge, adjust each idle screw for peak vacuum, then back out 1/8 turn from lean best idle.
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Accelerator Pump: Three holes on the pump arm for different pump shot volume. Top hole = largest shot (for engines that bog on tip-in).
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Step-Up Springs: Factory 5" Hg (silver) spring works for most street engines. Lower vacuum camshafts need softer springs (3" or 4" Hg).
Frequently Asked Questions
Q: Should I get the 1405 or 1406 for my truck?
A: For a daily-driven truck or any vehicle you want to start easily in all weather, the 1406 (electric choke) is the better choice. The 1405 (manual choke) requires installing a choke cable through the firewall and manual adjustment every cold start — better suited to dedicated race/off-road vehicles.
Q: Where do I connect the electric choke wire?
A: Connect to a 12V ignition-switched source — typically the ignition coil positive terminal, an IGN terminal on the fuse block, or the alternator field wire. DO NOT connect to the coil negative or to a constant 12V source (will drain battery).
Q: Will this fit my Quadrajet intake?
A: Quadrajet (spread bore) intakes require a square bore to spread bore adapter plate. Alternatively, consider an aftermarket dual-plane square bore intake manifold for best results.
Q: Does this carb work at high altitude?
A: The 1406 runs slightly rich at altitude. Above 5,000 feet, step down 1-2 jet sizes (factory primary jets: .098", secondary: .095"). For altitudes above 7,000 feet, consider a calibration kit with altitude-specific rods and jets.
Q: What's included in the box?
A: Complete assembled carburetor, mounting gasket, throttle ball stud, throttle return spring bracket, installation manual, and tuning reference chart.
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