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 LS1/LS2 cathedral port cylinder heads.This product is intended for carburetted, throttle body EFI, or port EFI applications.