USTAR 1405 600 CFM 4-Barrel Square Bore Carburetor - Manual Choke

In this review the USTAR 1405 600 CFM carburetor is evaluated for street and restoration V8s that need a reliable, mechanical replacement. The bottom line: this carburetor is best for classic Chevy, Dodge and GMC V8 engines that are not computer controlled and need a straightforward, manually choked 4-barrel unit. Installers will appreciate the aluminum construction and leak-free design, and the single biggest reason to buy is the direct-fit compatibility with a range of 5.0L to 5.9L V8s where an aftermarket mechanical carburetor is required for performance and drivability.

Key Features

• Compatibility: Fits multiple small- and medium-block V8 engines including 5.0L, 5.2L, 5.7L, 5.8L and 5.9L, making it a versatile replacement for many older vehicles.
• CFM Rating: Rated at 600 CFM, the carburetor provides sufficient air flow for street and mild performance applications that match that capacity.
• Construction: Made from aluminum to reduce warping over time, the design aims to remain dimensionally stable under heat and use.
• Manual Choke: The manual choke provides simple, predictable cold-start operation without electronics, useful for non-computer-controlled engines.
• Leak-Free Design: The unit is precisely built and tested to minimize leaks and deliver consistent fuel metering for reliable performance.
• Complete Kit: Ships with the 1405-600 CFM carburetor and all pictured parts so installers have what they need for a straightforward swap.

Who It's For

This carburetor is aimed at owners and mechanics working on classic or older vehicles with non-computer-controlled V8 engines who need a direct replacement for a square-bore 4-barrel setup. It suits street restorations, mild performance builds, and replacements on trucks and muscle cars where 600 CFM is appropriate.

It is not suitable for late-model vehicles with electronic engine controls or for builders who require an electric choke or multi-stage fuel management; those users should look for an EFI conversion or a computer-compatible carburetor system.

Pros & Cons

Pros

• Direct compatibility with a broad set of 5.0L to 5.9L V8 engines simplifies part selection for many classic vehicles.
• Solid aluminum construction limits warping and helps maintain a reliable seal over time.
• Manual choke and simple mechanical design make troubleshooting and adjustments straightforward for DIY mechanics.

Cons

• Not suitable for computer-controlled engines, so it will not work with modern EFI or PCM-managed systems.
• Manual choke requires driver intervention at cold start, which some users may find less convenient than automatic alternatives.

Specifications

Our Verdict

The USTAR 1405 600 CFM 4-barrel carburetor is a practical, value-minded replacement for older V8s that require a manual-choke square-bore unit. Its aluminum construction and included hardware make installation straightforward, and it delivers reliable, predictable performance for non-computer-controlled Chevy, Dodge and GMC engines. Buyers looking for a simple mechanical swap will find it a sensible choice.

Frequently Asked Questions

Will this carburetor work on modern computer-controlled engines?
No. This carburetor is not suitable for computer-controlled applications and is intended for mechanical, non-PCM-managed engines.

Which engines is it compatible with?
It is compatible with 5.0L 305Cu, 5.2L 318Cu, 5.7L 350Cu, 5.8L 351Cu and 5.9L 360Cu V8 engines as listed by the manufacturer.

Does it include all necessary parts for installation?
Yes. The package includes the 1405-600 CFM carburetor and the parts shown in the product images; buyers should check the picture to confirm included components.