Description
Product Overview
Unleash your V8's full potential with the iFJF 1407 4-Barrel Carburetor. This 750 CFM performance carburetor features a manual choke, square bore design, and mechanical secondaries — the go-to setup for street performance and weekend strip runs. The striking golden finish isn't just for looks — it's a corrosion-resistant coating that protects against ethanol-blended fuels. Whether you're building a crate motor, restoring a classic muscle car, or upgrading from a tired 2-barrel, the 1407 delivers crisp throttle response and reliable fuel delivery.
Key Features
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750 CFM Flow: Ideal for 350-454 cubic inch V8 engines — supports up to 500+ horsepower with the right cam and intake.
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Manual Choke: Simple, reliable cold-start enrichment — pull the cable, fire it up, push it in when warm. No vacuum diaphragm to fail.
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Square Bore Design: Compatible with most aftermarket intake manifolds (Edelbrock Performer, Weiand, Holley pattern).
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Mechanical Secondaries: Instant throttle response — secondaries open with your right foot, not engine vacuum. Perfect for aggressive driving.
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Golden Dichromate Finish: Corrosion-resistant coating protects against modern ethanol-blended fuels and looks great under the hood.
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Air Valve Secondary: Adjustable secondary air valve tunes the transition from primary to WOT — eliminates the bog common with vacuum secondary carbs.
Recommended Applications
| Engine Size |
Cam Type |
Usage |
| 350-383 CID |
Mild to Hot Street |
Street / Weekend Strip |
| 400-454 CID |
Stock to Mild |
Street Cruiser / Towing |
| 383-454 CID |
Hot Street / Race |
Strip / Performance Street |
Specifications
| Spec |
Detail |
| Model |
1407 |
| CFM Rating |
750 |
| Barrels |
4 |
| Choke |
Manual |
| Bore Type |
Square Bore |
| Secondaries |
Mechanical with Adjustable Air Valve |
| Finish |
Golden Dichromate |
| Fuel Inlet |
Single (3/8" NPT) |
Tuning Tips
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Set Float Levels: Adjust to the middle of the sight glass window with the engine running — too high causes rich idle, too low causes lean stumble.
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Idle Mixture: Start at 1.5 turns out. Adjust for highest vacuum reading, then back each screw out 1/8 turn for a slightly rich idle — smoother transition off-idle.
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Secondary Air Valve: Adjust the spring tension to open secondaries without bogging. Too loose = bog; too tight = secondaries never open. Start with 3/4 turn of preload.
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Fuel Pressure: Keep fuel pressure between 5-7 psi. Above 7 psi can overwhelm the needle and seat, causing flooding.
Frequently Asked Questions
Q: Will this carburetor fit my intake manifold?
A: The 1407 has a square bore bolt pattern compatible with most aftermarket 4-barrel intake manifolds (Edelbrock, Weiand, Holley-square-bore). It will NOT fit a spread-bore manifold (Quadrajet pattern) without an adapter plate.
Q: Is 750 CFM too much for my 350?
A: A 750 CFM carb works well on a 350 with a performance cam, headers, and intake. For a bone-stock 350 with stock heads and cam, a 600-650 CFM carb would be better matched. The 1407's air valve secondaries help prevent over-carburetion by only flowing what the engine demands.
Q: How is the manual choke set up?
A: You'll need a manual choke cable kit (sold separately) routed to the cabin. Mount the cable under the dash, connect it to the carb's choke lever, and adjust for full open/close travel. Many hot-rodders prefer manual chokes for their simplicity and reliability.
Q: Does this carb support a kickdown linkage?
A: Yes — the throttle lever includes provisions for GM TH350/TH400, Ford C4/C6, and Chrysler 727 kickdown linkages. An aftermarket bracket may be needed for some applications.
Q: Is this ready to run out of the box?
A: The 1407 comes pre-calibrated for a typical performance V8. You'll need to set the idle speed, idle mixture, and float levels. The secondary air valve may need adjustment based on your specific engine combination.
