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Flow Design carburetor adapters are CNC machined for optimum fuel distribution at high velocities. The shape of each adapter is designed to work with the shape of specific intake manifold plenums. Flow Design adapters have been dyno tested, flow tested and race proven. Fits Performer, Performer EPS and Performer RPM intakes. 1" tall. This spacer adapts 4412 to dual plane intake. (performer, performer eps & performer rpm). Does not include gaskets, bolts, or studs.