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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 4412 to Rochester to untouched Q-Jet intake. 1" tall. This spacer adapts 4412 to Rochester to Untouched Q-Jet intake.