Chevy Engine Only Small Block Hugger Stainless Steel Header (Pattern 283, 305, 327, 350, 400, etc) CNC-machined, made by High Quality Stainless Steel with Mandrel Bent Pipes Bolt-On Design, Increase Horsepower and Torque Gasket, Nuts and Bolts are Included Direct Fit bolt-on Replacement, No Welding Required, Uses OEM Style Connections Heavy Duty Laser Cut Port Flanges-No Warping or Leaking Premium Gaskets and Hardware