390-950CFM Holley Pro Series Renew Kit

The 390-950CFM Holley Pro Series Renew Kit by ADVANCED ENGINE DESIGN is a complete carburetor renewal and rebuild solution engineered for serious enthusiasts and mechanics restoring or upgrading carbureted fuel systems. Whether you're servicing a high-performance street engine, off-road machine, or classic vehicle, this kit addresses the critical need for reliable fuel metering and atomization across the full 390 to 950 CFM flow range. Holley carburetors remain the industry standard for naturally aspirated engine tuning, and maintaining them with factory-specification renewal kits ensures peak efficiency and drivability.

This Pro Series renewal kit includes precision-engineered internal components—jets, needles, gaskets, seals, and metering surfaces—that restore worn carburetor passages to original specifications without requiring complete replacement. The kit's engineering accommodates the broad CFM range, making it suitable for both moderate street applications and aggressive carburetors used in performance builds. Each component is manufactured to tight tolerances, ensuring consistent fuel delivery at idle, cruise, and wide-open throttle conditions. Proper renewal maintains fuel atomization quality and prevents lean stumbles or rich flooding that plague aged or damaged carburetors.

Mechanics and builders favor this kit when diagnosing persistent cold-start hesitation, stumbling off-idle, or inconsistent idle quality on Holley-equipped vehicles. Installation requires basic carburetor disassembly skills and attention to gasket sealing—no special tools needed beyond standard hand tools and a clean work surface. The compact kit dimensions (7.8 x 1.55 x 8.75 inches) store easily in any shop, making it essential inventory for professionals maintaining multiple carburetors or hobbyists tackling a long-term restoration project.