Description
Product Overview
This iFJF 1901R Quadrajet 4MV 750 CFM 4-barrel carburetor is a precision-engineered replacement for 1966-1973 Chevy vehicles (327, 350, 396, 427, 454 engines) and 1975-1979 C3 Corvettes. Designed as a direct bolt-on upgrade, it delivers reliable fuel delivery with vacuum secondaries and manual choke operation — ideal for street performance, restoration projects, and daily drivers.
Key Features
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750 CFM Flow Rate — Optimized for small block and big block Chevy engines from 327 to 454 cubic inches, providing balanced air/fuel mixture across the entire RPM range.
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Vacuum Secondary Operation — Secondaries open progressively based on engine demand, preventing bogging while delivering full power when you need it.
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Manual Choke Control — Gives you complete control over cold starts — no fussy automatic choke mechanisms to fail.
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All-Aluminum Construction — Two-piece die-cast aluminum body resists warping, corrosion, and fuel degradation better than original pot metal castings.
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Square Bore Flange — Standard 4-barrel square bore pattern fits OEM Quadrajet intake manifolds with no adapter required.
Compatibility
| Year |
Make |
Model |
Engine |
| 1966-1973 |
Chevrolet |
Camaro, Chevelle, Nova, Impala, C10, C20 |
327, 350, 396, 427, 454 |
| 1975-1979 |
Chevrolet |
Corvette (C3) |
350, 454 |
| 1966-1973 |
Chevrolet |
Chevy II, Monte Carlo, El Camino |
327, 350, 396, 454 |
| 1968-1973 |
GMC |
C15, C25, K15, K25 Trucks |
350, 396, 454 |
Specifications
| Parameter |
Value |
| Part Number |
1901R (Replaces 7026202, 7026203, 7026210, 7027202, 7027203) |
| CFM Rating |
750 CFM |
| Barrels |
4-Barrel (Square Bore) |
| Choke Type |
Manual Choke |
| Secondary Type |
Vacuum Secondary |
| Body Material |
Die-Cast Aluminum |
| Throttle Bore |
1-11/16" Primary / 2-1/4" Secondary |
| Fuel Inlet |
Single 5/8"-20 Thread |
| Finish |
Natural Cast Aluminum |
Why Choose iFJF 1901R Quadrajet?
The original Rochester Quadrajet was a brilliant design but suffered from warped bodies, leaky well plugs, and worn throttle shafts after decades of service. Our 1901R replacement addresses all these weaknesses with modern CNC machining, improved aluminum alloy, and precision calibration. You get the signature Quadrajet sound and performance without the headaches of a 50-year-old core. Each unit is wet-flow tested before leaving the factory. We stand behind every carburetor with our satisfaction guarantee.
Installation Tips
- Verify intake manifold is square bore pattern (not spread bore without adapter)
- Set idle mixture screws to 2-1/2 turns out as starting point
- Use a phenolic spacer to reduce heat soak on hot starts
- Check fuel pressure — Quadrajets prefer 5-6 PSI maximum
- Connect choke cable to manual choke linkage before final mounting
- Torque mounting bolts to 12-15 ft-lbs in a crisscross pattern
Frequently Asked Questions
Q: Will this fit my 1969 Camaro with a 350?
A: Yes. This 1901R Quadrajet 4MV is a direct replacement for 1966-1973 Chevy 327-454 engines with a square bore intake manifold. Your 1969 Camaro 350 is a perfect match.
Q: Does this carburetor come with a gasket?
A: Yes, a base gasket is included. We recommend using a quality fiber gasket or 1/4" phenolic spacer for best results.
Q: Is this a rebuilt original or brand new?
A: This is a 100% brand new carburetor — not a remanufactured or rebuilt core. No core charge, no waiting for a rebuild.
Q: Do I need an adapter to install this on a spread bore manifold?
A: This is a square bore carburetor. If your intake manifold is a spread bore (common on later Quadrajets), you will need a square-to-spread bore adapter plate (sold separately).
Q: How do I adjust the manual choke?
A: The choke lever connects to a standard choke cable (not included). Route the cable through your firewall and mount under the dash. Pull to close choke for cold starts, push to open as engine warms.
Q: What's the difference between vacuum secondary and mechanical secondary?
A: Vacuum secondaries open based on engine load — they only engage when the engine can actually use the extra air/fuel. This prevents bogging and improves driveability on the street compared to mechanical secondaries.
Q: Does this carburetor have EGR provisions?
A: No. This carburetor does not include EGR provisions, making it ideal for non-emissions applications, off-road use, or vehicles with EGR deleted.
