Intake Manifold, Performer, Dual Plane, Aluminum, Natural, Square Bore Flange, AMC, 304, 360, 390, 401, Each Intake Section Included:CompleteEngine Block Deck Height:Standard deckCarburetor Quantity:OneIntake Style:Dual planeBasic Operating RPM Range:Idle-5,500Intake Manifold Height:4.850 in.Intake Finish:NaturalIntake Material:AluminumEGR:NoQuantity:Sold individually.Notes:Will not accept Motorcraft spread bore carburetor. Will not work with ’69 and earlier cylinder heads. Two center bolt holes offset. Do not use competition style intake gaskets for this street manifold. A factory metal valley tray gasket along with a composite/paper style gasket such as the EDL-7213 must be used.