| Make |
Model |
Engine |
Notes |
| Chevrolet |
Corvette, Camaro, Chevelle, Nova, Silverado, C10, Impala |
305, 327, 350, 383, 396, 400, 427, 454 V8 |
Square bore intake required |
| GMC |
Sierra, C/K1500, Jimmy, Suburban |
305, 350, 396, 454 V8 |
Verify intake manifold flange |
| Pontiac |
Firebird, Trans Am, GTO, Grand Prix |
350, 400, 455 V8 |
Aftermarket intake recommended |
| Oldsmobile |
Cutlass, 442, Delta 88 |
350, 403, 455 V8 |
Check hood clearance |
The AFB-style architecture eliminates power valve failure — a common issue with Holley-style carbs. The two-piece body design allows jet and rod changes without draining fuel or removing the carburetor. Whether you're building a weekend cruiser Corvette, a street/strip Silverado, or restoring a classic GMC, the 1405's 600 CFM flow rate is the sweet spot for street-driven V8s.
Frequently Asked Questions
Q: Will this fit my stock intake manifold?
A: This carburetor has a standard square bore flange pattern. It fits stock 4-barrel square bore intake manifolds found on most 1960s-1980s GM V8 engines. If you have a spread bore intake (Quadrajet-style), you'll need a square bore to spread bore adapter plate.
Q: Can I add an electric choke later?
A: Yes. The iFJF 1478 Electric Choke Kit is a direct bolt-on upgrade that converts this manual choke carburetor to electric choke operation. Check our store for the 1478 kit.
Q: What's the difference between the 1405 and 1406?
A: The 1405 comes with a manual choke (cable-operated), while the 1406 has an electric choke. The 1405 is preferred by performance enthusiasts who want full control over cold-start enrichment, while the 1406 is ideal for daily drivers who want set-and-forget convenience.
Q: Does this carburetor come pre-tuned out of the box?
A: Yes, it comes with factory baseline jetting and metering rods calibrated for 600 CFM on typical street V8 engines. Fine-tuning may be needed based on your specific engine displacement, cam profile, altitude, and exhaust setup.
Q: What gaskets and hardware are included?
A: The carburetor includes the mounting gasket, fuel inlet fitting, and basic hardware. We recommend purchasing a quality intake manifold gasket set separately for your specific application.
Q: Is this carburetor compatible with EGR systems?
A: No — this carburetor does not have an EGR provision. It is designed for non-EGR performance applications or vehicles where the EGR system has been removed. For off-road and racing use only where emissions equipment removal is legal.
Q: What horsepower range does 600 CFM support?
A: A properly tuned 600 CFM carburetor can support 350-450 horsepower on typical street V8 engines. For engines exceeding 450 HP, consider stepping up to a 750 CFM unit.
