For Ford Big Block Hugger BBC V8 Engine 4-1 Stainless Steel Shorty Header Exhaust Manifold - 429 460 BBF Universal Shorty Headers (pair); Huge 2" Stainless Primary Tubes CNC Mandrel Bent Pipes for Excellent Flow; Professionally Tigged Welds 4 to 1 Header Design Includes Gaskets and Collector Bolts Header Inlet/Outlet : 1.5"x2.125"(Oval)/3.375" / 0.375" Thick Flanges / 2.5" Collector Reducer included