Adapts Q-Jet/Rochester pattern to Rochester pattern carb-to-manifold or manifold-to-carb. Bolts, nuts, studs and both gaskets are included. Quad bolt pattern: 4-1/4" x 5-5/8" Two-barrel flange is multi-pattern. Big 2-barrel pattern on centers: 5-1/8" x 3-1/2" Multi pattern on centers: 3-1/4" to 3-3/4" x 1-3/4" to 2"