289302 Dual - Plane Intake Manifold for use with 8.206 - in. deck height block and inline valve heads. 4.375 - inches at the front of the carburetor pad and 5.250 - inches at the rear. 1500 - 6000 rpm range, dual plane intake and excellent fuel distribution. For use with any mid - rpm small block application, great for street cars and mild race engines. Does not fit Z or the GT - 40 X heads.