These Turbonetics carburetor pressure plenums are designed to fit most American 4-barrel carburetors and some 4-barrel EFI throttle bodies. These plenums can be used to adapt a forced induction system to your vehicle or cold air and Ram Air style intakes. These cast aluminum plenums are ball-burnished with a 3 in. diameter side entry and their low-profile design is great for limited-clearance hood applications.