390-950CFM Holley Renew Kit

The 390-950CFM Holley Renew Kit from Advanced Engine Design is engineered for serious engine builders and restoration enthusiasts who demand proven carburetor performance on both street and strip applications. This renewal kit addresses the common wear patterns that develop in high-mileage Holley carburetors, restoring factory calibration and fuel delivery precision without requiring a complete carburetor replacement. Whether you're rebuilding a classic muscle car, restoring a vintage hot rod, or maintaining a turbocharged street engine, this kit delivers the reliability and consistency that separates a properly tuned platform from a temperamental combination.

This renewal kit contains genuine Holley replacement components designed to restore fuel atomization, idle quality, and throttle response across the full 390–950 CFM operating range. The precision-machined parts—including jets, gaskets, seals, and metering circuits—are manufactured to original OEM tolerances, ensuring consistent fuel delivery and proper air-fuel ratio stability. By replacing worn internal passages and calibration components, the kit eliminates carbon buildup effects and fuel seepage that accumulate over years of service, restoring the carburetor's ability to maintain tight mixture control under load, cruise, and acceleration conditions.

This kit is ideal for mechanics and enthusiasts rebuilding Holley four-barrel carburetors in the 390–950 CFM bracket, commonly found on small-block and big-block applications from the 1960s through 1980s. Installation requires basic carburetor knowledge and standard hand tools; the compact kit weighs 0.48 lbs and fits easily in a workbench setup. Compatibility spans all Holley models within this CFM range, making it a cost-effective alternative to purchasing a new carburetor when your current unit shows signs of lean stumble, fuel weeping, or erratic idle behavior.