The Edelbrock Performer Intake Manifold Top is manufactured from aluminum and given a natural finish. They feature a patented runner design and have a non-EGR (Exhaust Gas Recirculation) style. This boosts the torque and horsepower over a wide RPM range, from off-idle to 6, 000 RPM. This Performer Series intake top is for 4-barrel carburetors and it has a square bore flange. They accept late-model choke, water neck, alternator, and air conditioning brackets. The gasket, linkage and brackets are included with the intake top.