Description This 2-1 header was designed for the 1937-1962 Chevy 216/235/261 6 Cylinder engines. It is made of high quality 201 stainless steel material, intended as a replacement for the hard to find factory cast iron manifolds. Features Inlet: 2" x 1.65" (Rectangle) and 1.65" x 1.65" (Square) Outlet: 2" (Diameter) 1-3/4" and 2" primary tubes 7/16" thick head flanges Collector Diameter: 2.000" Flange Thickness: 0.31" 2 x 2-1 (4-2) Racing design Increase high flow air, instantly gain 10 to 15 Hp. / Tq Fitment For 1937-1962 Chevy 6CYL 216/235/261 (except 1954 Chevrolet Bel Air Base Sedan 4-Door)

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