650 CFM Square Bore Carburetor

The Holley ND4227 is a high-performance, 4-barrel carburetor built on the robust 4150 series platform. This unit offers a substantial 650 CFM (Cubic Feet per Minute) airflow capacity, making it suitable for a wide range of performance applications, from street machines to dedicated race vehicles. Its square bore design and mechanical secondary operation provide precise throttle response. The 4150 series is a well-established design from Holley, recognized for its reliability and tunability. The ND4227 specifically omits a choke, simplifying its design and making it ideal for applications where cold-start enrichment is handled by other means or in warmer climates. While the specific fitment for the ND4227 is noted for Chevrolet vehicles from 1963-1965 with 396-427 cubic inch engines, Holley carburetors are often adapted to various V8 applications. It is crucial to verify compatibility with your specific intake manifold and engine build to ensure optimal performance and fit.