condgreemee 1406 600 CFM 4-Barrel AFB-Style Carburetor — Square Bore, Electric Choke, Two-Step Metering

Condgreemee 1406 is a 600 CFM, 4-barrel AFB-style square-bore carburetor built as a direct replacement for Performer-style manifolds and classic GM small-block applications.

This aftermarket carburetor is designed to restore throttle response and drivability on V8 engines that accept a square-bore AFB pattern. It pairs a bottom-feed primary venturi booster and two-step metering rod system to smooth transitions between circuits, while non-adjustable electric-choke secondary air valves simplify plug-and-play replacement. The unit is new, ready to install, and intended for use on compatible intake manifolds and older, non-computer-controlled ignition systems.

Will this carburetor fit my engine and intake manifold?

The Condgreemee 1406 is compatible with a wide range of Performer-style manifolds and similar square-bore AFB designs. It fits many Chevrolet, Ford, Mercury and GMC small-block swaps that accept a 4-barrel square-bore pattern, but it is not intended for late-model computer-controlled fuel systems.

• Fits Performer, Performer EPS, Performer RPM, RPM Air-Gap, Torker II and similar manifolds
• Commonly used on vintage Silverado, Corvette, Mustang, Mercury and GMC pickups
• Not compatible with GM vehicles using Q-Jet systems from 1981+ or AOD transmissions 1981+
• Check flange bolt pattern and throttle linkage geometry before installation

How does the metering system affect performance?

This carburetor uses two-step metering rods that help manage fuel delivery during transitions between idle, cruising, and part-throttle. The design reduces the chance of backfire during circuit changes and reduces stress on power valves by controlling fuel enrichment more predictably.

• Two-step metering rods for smoother circuit transition and tuning flexibility
• Bottom-feed primary venturi booster improves throttle response
• Non-adjustable secondary air valves simplify setup while maintaining performance
• Removable metering rods let you fine‑tune jetting for specific engine needs

What comes in the box and what should I prepare for installation?

The carburetor ships ready to install but does not include printed installation instructions. Expect the unit to arrive assembled like the product photos; you may need gaskets, throttle and kickdown linkage, and possibly minor tuning based on your engine and manifold combination.

• Packaged carburetor as shown in product images (gaskets and hardware may not be included)
• No paper instructions—use reputable setup videos or factory service guides
• Prepare new intake and carb gaskets, fuel line fittings, and correct throttle linkage
• Verify compatibility with ignition timing and vacuum advance systems before running

Are there limitations or vehicle exclusions I should know about?

Yes—this carburetor is intended for older, non-computer-controlled applications and specific transmissions. It will not work with many late-model EFI or certain controlled-carburetor systems without significant modification.

• Not for computer-controlled fuel systems or vehicles with factory Q-Jet from 1981 onward
• Not recommended for AOD-equipped automatic transmissions from 1981 onward without proper calibration
• Requires appropriate manifold bolt pattern, throttle geometry, and fuel pressure regulation
• Professional installation recommended if you are unsure about compatibility

Who this is for: car enthusiasts, restoration shops, and DIY mechanics rebuilding classic V8s who need a straightforward 600 CFM, 4-barrel square-bore replacement. If you drive a vintage Silverado, Corvette, Mustang, Mercury or GMC truck with a Performer-style intake and a non-computerized fuel/ignition system, this Condgreemee carburetor offers a serviceable, tunable option to return reliable fueling and throttle response. If your vehicle uses modern engine controls or late-model GM Q-Jet/AOD configurations, consult an expert before purchasing.