Hedman Hedders 68230 Painted Hedders Exhaust Header Features: Highest Quality Materials Computerized Precision Hand Tested; Sturdy Leak Proof Welds Durable And Affordable Height: 9.50 Width: 18.25 Length: 46.00 Weight: 27.00 lbs Vehicle Type: 2694 Fitment: 1964/Chevrolet/Impala/SS/5.4L 327Cu. In. V8 GAS Naturally Aspirated::Will Fit With Angle Plug Heads/Chevy Aluminum Only~ Elite Replacement Gasket PN[27520]~ Legal Only For Racing Vehicles Which May Never Be Used Upon A Highway^^1964/Chevrolet/Impala/SS/4.6L 283Cu. In. V8 GAS Naturally Aspirated::Will Fit With Angle Plug Heads/Chevy Aluminum Only~ Elite Replacement Gasket PN[27520]~ Legal Only For Racing Vehicles Which May Never Be Used Upon A Highway^^1964/Chevrolet/Impala/Base/5.3L 5358CC 327Cu. In. V8 GAS OHV Naturally Aspirated::Will Fit With Angle Plug Heads/Chevy Aluminum Only~ Elite Replac...