Convert your GM LS engine from EFI to Non-EFI carburettor in retro-fit applications with this Aeroflow Performance Street low rise cast intake manifold.This single-plane intake manifold is designed to keep your air and fuel distributiongoing into the engine at a steady and even flow for maximum performance and efficiency. The carburettor-mounting pad is designed to accept aftermarket4150 square-bore carburettors with either manual or electricchoke options available on todays market. Specificallydesigned to suit GM LS Gen IIIand IV engines equipped with OE or aftermarket LS3 rectangle port cylinder heads.This product is intended for carburetted, throttle body EFI, or port EFI applications.