The Edelbrock Vortex Performer Intake Manifold is designed for square bore flange (non-EGR) and is intended to replace the OEM unit. This dual-plane Performer Vortex intake manifold is based on Edelbrock s very popular Performer Series. It is used for street rods and accepts both square-bore and spread-bore carburetors and produces power from idle to 5, 500 RPM. It has provisions for external water bypass and may be used on either Vortex blocks or 1995 and earlier blocks but has no provision for exhaust-heated chokes. It accepts late model water neck, alternator, HEI and air conditioning and will not fit under the stock Corvette hood.