PRW Industries 4228371 Rochester Q-Jet Marine Carburetor 650 CFM Electric Choke

The PRW Industries 4228371 is a brand-new Rochester QuadraJet (Q-Jet) marine carburetor rated at 650 CFM, purpose-built as a direct upgrade replacement for stock GM marine applications. Unlike rebuilt or remanufactured units, this carburetor is assembled from all-new components and run-tested before shipment, ensuring reliable out-of-the-box performance on the water.

Engineered specifically for marine use, the 4228371 features an industry-first lean/rich adjustment allowing up to 15% +/- main circuit tuning, making precise fuel delivery calibration straightforward without specialized equipment. The carburetor comes equipped with Mercruiser Marine-compatible throttle linkage and meets U.S. Coast Guard requirements for marine carburetor safety standards.

Key Features:

• Brand new — not rebuilt or remanufactured
• 650 CFM flow rating — ideal for GM small-block V8 marine engines (283–350 cu. in.)
• 4-barrel, spread-bore design replaces OEM Rochester QuadraJet carburetors
• Industry-first lean/rich adjustment: up to 15% +/- main circuit adjustment for precise tuning
• Includes Mercruiser Marine throttle linkage
• One-wire electric choke for easy hookup
• Includes most required vacuum ports (unused ports capped)
• Meets U.S. Coast Guard requirements
• Locally assembled and run-tested in the USA
• All gaskets, metering rods, jets, and air bleeds made in the USA
• Compatible with stock spread-bore intake manifolds and most OEM marine linkage components
• 49-state legal (not CARB/California emissions certified)
• 6-month warranty

The PRW Q-Jet 4228371 is a universal replacement for most non-computer-controlled GM marine V8 applications, fitting stock spread-bore intake manifolds as well as aftermarket spread-bore manifolds. Gasoline-fueled, vacuum-secondary, single-inlet design with a polished finish.